with submarines you would need them for water cave is you didn't have a submarine in a water cave you would die even if you had a water breathing the player would get scrapes on the rock and the water presser would do it so submarines would help in that part of it they would be like the one for the mob vote small but you would have at least have one chest of stuff that you can store and it will have a robot arm so you can get iron and stuff.
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