could you add a large oxygen balloon that will have 2 times more oxygen than a normal oxugen tank. Do it so that it can be installed only on a diver suit. If you do this, then underwater expeditions will become easier. Do it to another A view that it can be distinguished from a standard oxygen tank. What do you think of my idea?

Expeditions are pretty easy already if you use oxygenite shards as the main source of oxygen in the ruins.

Also, large oxygen tanks cannot be stock in inventory, just in hands. This suggests if your oxygen tank should have 2 times more content than normally. Large oxygen tanks cannot be put into oxygen tanks. but can be attached to walls. They have 4 slots inside and oxygen tanks are draining their content into them, that's how they replenish large oxygen tanks. Large oxygen tanks also decreases stun duration on wearer by 20%.