Scuba gear should "respawn" when you re-enter an area.. I believe it respawns in both the hut in Bayjin and the Umpani caves.
BTW, I think the Umpani caves is just about the most boring area of the whole game. I know it's not critical and you can just skip it (esp. if you don't have a Gadgeteer in the party) but I feel obligated to go thru all parts of a game (leave no stone unturned etc)..
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