The diving bell is one of the earliest types of equipment for underwater work and exploration. Its use was first described by Aristotle in the 4th century BC: "...they enable the divers to respire equally well by letting down a cauldron, for this does not fill with water, but retains the air, for it is forced straight down into the water.
perhaps q of couldran effects where can dive and an actual diving bell is need for deep ocean
when a ship sinks a wreck on bottom is created near by and you have to search by lowering bell down if can get deep enough and also forageing and whale bones or something also found
res nodes (volcano spouts, coral reefs, ect)
a late game thing prob cause of the extremely slow nature of exploreing ocean it will remain fresh for long time
crazy in the heat of the moment idea