How much time did you usually have to operate Crabster underwater each day? Were there any time limits based on Crabster's power supply, outside operating conditions or official limits set by the government officials directing the operation?

When we surveyed the Sewol, the coast guard gave us just one and half hours, but we surveyed more than two and half hours. When we surveyed 0.5~1km distance from Sewol, there was no time restriction to survey except mothership’s drift. Crabster remained seafloor until the mothership drifted apart from Crabster by wind and current. Crabster used to stay on seafloor 0.5~ 2 hours at a time.