Location: Cascadia Basin (formerly known as ODP 1027) Date: May 22, :00 Constraints: none ROV Dive #1693

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1 Page 1 of 10 DIVE PLAN Leg 2 Dive 5 Cascadia Seismometer Swap Location: Cascadia Basin (formerly known as ODP 1027) Date: May 22, :00 Constraints: none ROV Dive #1693 Objectives existing BB Seismometer NC27 (DeviceID: 11057, 402) Deploy replacement BB Seismometer (DeviceID: 21620, 21402) existing Seismometer Aux platform (DeviceID: 23067, 22401) Deploy replacement Seismometer Auxilary Platform (DeviceID: 21012, 22791) existing CTD (DeviceID: 23036, 23052) Deploy replacement CTD (DeviceID: 23035, 23049) existing ONCIC platform (DeviceID:12700, 23179, 22810, 22808, 23178) Deploy replacement ONCIC platform (DeviceID: 22810, 23085, 22859, 23294) Dive Dependents 1. Line laser and ROV porch grating orientation reference to ROV heading 2. High security instrument representative John Dorocic notified about swap of Seismometer 3. Seismometer data to be deleted from Memory card before recovery 4. NC27 Seismometer was sent and responded correctly to RECOVER command 5. New Seismometer I/O line status Aux_power preset as Output, low (off) Ship Procedure 1. Transit to site, assess weather and sea state. Proceed only when it is safe to do so 2. Deploy ROV USBL pole ACTION LATITUDE LONGITUDE DEPTH Surface freefall Aux Platform ' ' 2654 Surface Freefall CTD ' ' 2654 Dive ' ' ' ' 2654 Shore Procedure 1. Monitor twitter feed 2. Stay on stand-by for port power off and topology update Communications with shore 1. On-shore team will tweet using twitter account at the beginning of the dive 2. Post the dive plan on the cruise website 3. On-board team connect via intercom with shore operations as required Navigation 1. Record positions of deployed platforms and satellite instruments 2. Guide surveys 3. Record interesting positions

2 Page 2 of 10 Dive Chief 1. Record deviations from dive plan 2. Record changes to site layout diagrams Site/Equipment ID s ACTION SITEID SITENAME DEVICEID DEVICENAME LATITUDE LONGITUDE DEPTH PORT EXT CABLE CascadiaBasin_ OIC_ CascadiaBasin_ OIC_ CascadiaBasin_ OIC_ CascadiaBasin_ OIC_ Connect/ Deploy Connect/ Deploy OBS_AuxiliaryP latform_ OBS_AuxiliaryP latform_ CascadiaBasin_ BBS_NC27_ CascadiaBasin_ BBS_NC27_ CascadiaBasin_ IP_ CascadiaBasin_ IP_ CascadiaBasin_ IP_ CascadiaBasin_ IP_ Deploy CascadiaBasin_ BBS_NC27_ Deploy CascadiaBasin_ BBS_NC27_ Deploy OBS_AuxiliaryP latform_ Deploy OBS_AuxiliaryP latform_ , OIC Can m J RBR BPR m J ONCEE pressure Sensor ONCEE pressure Sensor Nortek Aquadopp Current Meter Differential Pressure Gauge Guralp CMG-IT Broadband Seismometer Guralp Strong Motion Accelerometer T5S27C Sea-Bird SeaCAT SBE16plus V Sea-Bird SBE 63 Dissolved Oxygen Sensor Sea-Bird SeaCAT SBE16plus V Sea-Bird SBE 63 Dissolved Oxygen Sensor Guralp CMG-IT Broadband Seismometer Strong Motion Accelerometer in Broadband Seismometer Nortek Aquadopp Current Meter NRCan Bottom Pressure Recorder m J m J10 (labeled ) ' ' 2660m J1 124, ' ' 2660m J1 124, ' ' 2654m J1 124/ ' ' 2654m J1 124/ ' ' 2661m J ' ' 2661m J ' ' 2661m J3 TBD ' ' 2661m J3 piggyback ' ' 2654m J1 TBD ' ' 2654m J1 TBD ' ' 2660m J1 TBD ' ' 2660m J1 TBD ROV / Equipment Requirements: 1. Tool Basket with replacement ONCIC Can and seismometer replacement supplies

3 2. Line Laser 3. Milk Crate 4. Two Nisken bottles 5. ZIP pump for digging out caisson 6. PVC ruler to determine depth to bottom of caisson, 71cm max 7. Knife to open bead bags 8. North marker 9. 4 Staples in tool basket 10. Minimal equipment on porch obstructing view for seismometer swap 11. Downlooking camera and light to have a clear view through porch 12. Seismometer in tool basket (confirmed early hours with Bob M.). ROV Procedure On Deck 1. Free-fall Replacement Seismometer Auxilary Platform 200m NE of BBS. 2. Free-fall CTD Monument 150 m NE of BBS. 3. Connect tool basket to ROV Page 3 of 10 Descent 1. Start recording, start streaming video to UVic, confirm both are being received. Start dive log. Confirm operation of all cameras. 2. Start ROV-mounted CTD 3. Descend ROV to location adjacent to present BBS. 4. Watch tool basket placement and help land in correct position 5. Release tool basket adjacent to Seismometer connection plug Freefall items 1. Collect CTD tripod and place within 10 meters of instrument platform at NW corner near J3. 2. Take float from CTD tripod and attach to present auxillary platform at BBS. Seismometer Swap 1. Confirmation required from Shore that data has been cleared and seismometer has been set to RECOVER state and power has been removed from J1 of JB-13 Cascadia Basin. 2. Power confirmed off on J1 JB-13. Position in front of AUX platform.

4 Page 4 of 10 Figure 1. Auxiliary Platform (Battery ON position) Figure 2. Battery Clamped (Battery ON position) 3. Freeup battery cable from platform.

5 Page 5 of Release battery clamp by using the rope ring attached to grey plastic ring to pull the grey plastic ring down and away from the platform off of bolt 5. Rotate battery 180 degrees to OFF position using the hockey pucks or the red bar. The handle will be moved from the edge of the platform towards the middle of the platform. 6. Remove battery from platform in OFF postion and deposit Battery on seafloor in OFF position. 7. Unplug battery cable from AUX platform once confirmed battery is in OFF position. Place cable connector on top of battery. 8. Reclamp battery clamp by using rope attached to plastic ring to pull the ring back over the bolt 9. Remove the Instrument Platform 70 m oily and the connector from the Seismometer from the Auxilary Platform slide connector, keeping the two connected to protect the pins. 10. Place PBOF connector, slide and seismomometer connector in a safe place. 11. Disconnect Seismometer from Aux Platform by unplugging the middle ODI connector. When the connector is removed the platform is marked INST. (minimum bend diameter of cable is 7 inches) 12. Place the middle ODI connector (instrument cable) a safe distance away from the platform. 13. Notify bridge of expected float release within next 20 minutes. 14. Take present AUX platform 200 meters to NE landing position of new AUX platform. 15. Land old AUX platform adjacent to new platform. 16. Attach recovery hook from float package to old AUX platform. 17. Request permission from bridge to release float package. 18. Release float package. 19. Take new AUX platform to location of old seismometer cable and 70 meter oily. 20. Place 70 meter oily with old seismometer cable near to new AUX platform to confirm position works with cable lengths. 21. Confirm Battery in OFF position. 22. Move Battery cable on AUX platform from parking position and plug into battery position. 23. Take old battery cable connector and plug into parking position (right side). 24. Take old battery with parking position (from right side) to tool basket for later recovery. 25. Confirm OFF position up. 26. Grab North Marker and measuring stick. 27. Transit to BBS location. 28. Remove staples from the cable (QTY? 4) Mostly located near the caisson. 29. Place in visible location near caisson. 30. Vacuum glass beads from caisson exposing the seismometer

6 Page 6 of 10 Figure 3. Seismometer thru ROV porch Once the north (white with arrow) rib is visible place a North marker outside the caisson to help line up the new seismometer Remove glass beads to below the equatorial flange of the sphere Gently lift old seismometer (DeviceId: 11057) from caisson and monitor cable. (Cable 124) Remember there are two connectors at the aux platform. Place near AUX Platform in direction of tool basket. Vacuum glass beads from the caisson to the depth of the measuring tool but not into the clay. The caisson is 71cm in length Install sufficient glass beads in bottom of caisson to provide level surface Remove new seismometer (Device Id: 21620) from tool basket and carefully place it centrally in caisson with the north rib aligned with the north marker previously installed. Bury the seismometer halfway in glass beads such that the ribs are still visible. Gently tip handle down, paying attention to position of cable relative to the auxiliary platform Determine azimuth of seismometer by taking several DSC photos looking down through the porch. Vehicle and heading output must be stable before photos are taken Position cable to exit from caisson parallel to seafloor and in the direction of the auxiliary platform (West). Ideally, it should be flat to the seafloor crossing the caisson lip. Max bend diameter is about 7 Place cable ends at new AUX Platform. Bury seismometer in glass beads to leave the seafloor as smooth as possible. There should be no obstructions to the bottom current. North marker should be removed and stowed during this operation Take digital still photos of the seismometer and its cable Staple cable to seafloor from the caisson to ~5m away so no part of the cable can be moved by the bottom current Keep one bag of glass beads for P-wave Cover the last ~5m of the cable with glass beads, leaving the seafloor surface smooth.

7 Page 7 of Store glass bead bags with staple on top and collect empty bags to place in mike crate on tool basket. 47. Return to new Auxilary platform (Nortek DeviceId: 21012, BPR Device ID: 22791) Connect auxiliary instrument platform. 1. Take old seismometer cable and oily and place in AUV platform to disconnect oily from old BBS cable. 2. Slide out old BBS cable. 3. Slide in new BBS cable (right position) 4. Connect PBOF cable (70 m oily) from the Instrument Platform to the slide connector from the seismometer 5. Connect seismometer (DeviceId: 21620) to Auxilary platform INST connector. 6. Release battery clamp by using the rope ring attached to grey plastic ring to pull the grey plastic ring down and away from the platform off of bolt 7. Rotate battery 180 degrees to ON position using the hockey pucks or the red bar. The handle will be moved from the edge of the platform towards the middle of the platform 8. Reclamp battery by using rope attached to plastic ring to pull the ring back over the bolt 9. Contact SHORE to power up instruments (J1 on JB -13) 10. Take position of auxiliary platform (DeviceIds: 21012, 22791) 11. Take heading of the Nortek (DeviceId: 21012) on the auxiliary platform. Sight down one side of the platform with the line laser 12. Place old seismometer in cradle in tool basket. Place the cable in the tool basket as well. Swap CTD 1. Pick up new CTD in Tool Basket. 2. SHORE to power down J3 on JB-13 and confirm. 3. Transit to Instrument Platform 4. Disconnect old CTD (DeviceID: 23036, 23052) with it s piggyback oxygen sensor from port J3 5. Connect the new CTD (DeviceID: 23035, 23049) to port J3 6. Place CTD at Monument previously located. Record position 7. old CTD and its cable from Instrument Platform horn. 8. Place instrument in the tool basket on top of the empty bead bags in the milk crate for recovery, Take O2 sample 1. Grab Niskin bottle pull cord in manipulator 2. Place bottle near to and at approximately the same height as the CTD 3. Trigger both bottles. ONCIC Platform (DeviceID:12700) 1. Obtain and record position and heading of existing OIC platform for comparison with prior measurements 2. Confirm J10 of (DEVICEID:10513) is powered down 3. Unplug ONCIC cable (extensionid:327) from J10 on Instrument Platform 4. Pull cable back to ONCIC Instrument Platform being careful not to snag the cable on anything. 5. Place ODI connector end onto ONCIC instrument platform. 6. Move platform to tool basket and deposit adjacent. Deploy ONCIC Platform (DeviceID:22810) 1. Confirm J10 of JB-13 (DEVICEID:10513) is still powered down 2. Position new ONCIC Platform due north of Instrument Platform location with orientation that allows for 70 meter oily to face instrument platform.

8 Page 8 of Un-rig and remove NAXYS Hydrophone from ONCIC platform and place adjacent to platform but away from direction of Instrument Platform cable run. 4. Unrig new ODI oily cable (70m) and pull to Instrument Platform 5. Power ONCIC platform and check for faults: a. Power J10 of JB-13 (DEVICE ID:10513) b. Check for isolation faults 6. Return to ONCIC platform and move NAXYS Hydrophone to new location. No more than 70m from ONCIC Platform North. 7. Record hydrophone position and take a DSC 8. Un-rig and remove WARN P-Wave sensor 9. Move to WARN P-Wave sensor location (20m from OIC platform West) 10. Check sediment consistency with Manipulator prior to insertion so cable will not break bulkhead connector 11. If hard, use zip jet to create hole. 12. Grab by ROV handle but check to confirm white side marked North faces North. 13. Push sensor vertically into the sediment until sensor is covered 14. Obtain and record position and heading of WARN P-Wave sensor and take a DSC 15. Use beads from bead bag to smooth out any spots that may cause turbulence 16. Obtain and record position and heading of ONCIC platform and take a DSC 17. Get an overall DSC picture of the experiment RDI ACDP (DeviceID: 23066) 1. Transit to RDI ADCP location 2. Record position and heading of ADCP. Sight along beam three 3. Take DSC of RDI ADCP Confirm present hydrophone position. Ascent 1. Secure old ONCIC Platform in tool basket 2. Secure old BBS into basket. 3. Secure old CTD with bungee. 4. Secure old AUX platform battery. 5. Attach tool basket onto ROV 6. Request permission for recovery from Bridge 7. ROV with tool basket

9 Page 9 of 10 Figure 6. Seismometer cable attached to Seismometer

10 Page 10 of 10 Niskin O2 water sample Staff Scientist responsible: Armaghan Attar Procedure for water sampling and in situ oxygen sample fixing 1) Collect water samples from desired depth with Niskin 2) On deck: fit silicon drawing tube with digital thermometer to spigot 3) Open the release valve (at the top end of the bottle) gently do not open all the way quickly as this might introduce bubbles into the bottle 4) Open the spigot with the open end of the silcon drawing tubing and check for bubbles in the tube. Remove bubbles by gently squeezing tubing and/or adjusting flow rate of water 5) While water is running through the tubing, place the open end at the base of the glass O 2 flask 6) Allow the flask to overflow 3X the total volume of the flask. Take care not to introduce bubbles 7) During the time it takes for (6) note the temperature 8) Close the spigot only after the open end of the drawing tube has been pulled from the flask 9) Add each of two reagents: 1mL of a) MnSO 4 ; and b) Na 2 S 2 O 3 5H 2 O. These reagents will be in dispensing bottles and should be kept at hand while drawing water to the flasks. 10) Seal the flask with the glass stopper only AFTER reagents have been added. 11) The tip of the reagent dispensers should extend below the neck of the oxygen flasks, so that precipitate does not form in the excess seawater above the neck of the flasks 12) Once the stopper is in place; invert the flask in a vigorous fashion repeatedly for 1 minute 13) Make sure that the flask number and event are recorded. Place the fixed sample in the O2 flask case; add distilled water onto the top of the flask to prevent diffusion of air during storage; and store in the cold room 14) Keep the reagents at room temperature in the lab between sampling events