I think it would be nice to add for laser cutter option to add ice cutting for a fresh water.
And maybe a flare gun to illuminate dark places and lure leviathan for a while away from your position.
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or you could build floating structure and this structure will be with drone. and you can have in your inventory bags for example you fill your inventory and you use one of these bags (somethink like beacon or waterproof locker) and…