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the material is waterproof but the seals around wrists, ankles and neck as well as zippers usually aren't. But wet suits aren't meant to be water proof, they're only meant to stop water from circulating around your body-which it would do if you didn't wear a suit.
Spacesuits are technically waterproof. Of course they are entirely airproof, otherwise the wearer would suffer total pressure loss in space, and air molecules are larger than water molecules so they are waterproof. However the effect of submerging a space suit in water maybe be detrimental to the material.
I must strongly advise you against Scuba diving in your space suit before before a trip into space.