> While technically possible, carrying a 500 kg payload at depths beyond 50 meters is extremely challenging and would typically involve commercial diving teams,

> While technically possible, carrying a 500 kg payload at depths beyond 50 meters is extremely challenging and would typically involve commercial diving teams, saturation diving techniques, or the use of ROVs. Those conditions would be challenging during the day, but what about at night? That seems downright impossible without a huge professional operation, not some poor maintained pleasure boat. The closest equivalent I can think of is cave diving but those tend to have guidelines placed by expert teams and those often take many expeditions over several years to fully place.