I think it should be a thing in the shops in-game, but for a respectable price.

I really don't see a use with this gamepass it would seem very useless to buy unless it's like 50 robux. The only thing i see players using this for is to find the sunken ship loot because that's the only thing underwater to collect unless you add the deep-sea fishing, submarines and plants to the game then I think you should add this.

To avoid this future item becoming "pay to win", I'd personally recommend it becoming a index reward for a corresponding island. Possibly useful for when more underwater vegetation is added.

So many gamepasses, the limit is endless!

There's a glitch where you can see the water as clear for like 1.5 seconds so it can be useful as well.

Bet

it would help a lot and if it was jems it would be nice for non-robux spenders (like the radar).

No this is defiantly pay to win