Diver A and Diver B are safely recovered into the bell. The bell has been landed on the ship. Both divers are uninjured. The vessel is clear of the immediate emergency. The saturation team will begin the decompression schedule. The master turns to the DPO. What is the first post-recovery action for the DPO and master?

A. Secure the vessel in a safe standoff position, suspend all DP operations, and begin the formal incident investigation and reporting process — the incident is not over simply because the divers are safe. The DP reference failures, the vessel position excursion, and the umbilical tension event all require formal investigation before any return to diving operations

B. Brief the next dive team on the incident verbally and resume work once the DGNSS units agree again

C. Resume DP operations and re-deploy the bell once references are restored — the decompression is the dive team's problem

D. Call the office to report the incident, then assess whether the USBL can be repaired before the next dive

A. Attempt to restart the USBL unit before informing the dive supervisor — it may self-recover within a minute

B. Reduce the DP position alert radius from 5m to 2m to compensate for the lost reference

C. Immediately inform the dive supervisor of the USBL dropout, place the operation on heightened alert, investigate the cause of the USBL dropout, and assess whether operations can continue on two DGNSS references alone per the ASOG — the dive supervisor must be told because they may need to decide whether to hold or recover Diver A based on the degraded reference status

D. Continue the operation — two DGNSS units are still active and position is stable. USBL is secondary

A. Two DGNSS units diverging by 3m is within normal GPS accuracy variation — continue operations

B. Switch to heading control only and maintain vessel heading — position control can be suspended temporarily

C. Accept whichever DGNSS unit is showing the northernmost position as it is likely the more conservative choice

D. With USBL already lost, the two DGNSS units diverging are the only remaining references — and a divergence of 3.1m that is increasing means the DPO cannot verify which unit is providing the correct position. This is now a critical reference degradation with a diver at 92m. The dive supervisor must be immediately updated and told the vessel now has no way to verify its true position. Consideration must be given to initiating Diver A's ascent while position is still believed to be acceptable