i-------------->.
it's through resin (rubber) manipulation..
remember resin buble in shabondy archipilego arc and how it help ships sail deep underwater???..
by releasing resin substance from his rubber body luffy will coat himself with resin buble and be able to swim without his evil fruit powers being drained..
the coating won't be in shape of resin ball but instead it will look like resin suit (air will be dried from inside resin buble)..
it's through resin (rubber) manipulation..
remember resin buble in shabondy archipilego arc and how it help ships sail deep underwater???..
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by releasing resin substance from his rubber body luffy will coat himself with resin buble and be able to swim without his evil fruit powers being drained..
the coating won't be in shape of resin ball but instead it will look like resin suit (air will be dried from inside resin buble)..