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It sounds like you're considering fashioning a "leash" so that when your mask or fins get knocked off, they'll stay attached to you.Are there pros to attaching a line to your mask and fins (and to yourself)?
As g1138 stated, entanglement hazard.Are there cons beyond not being comfortable?
cave and wreck divers will regularly wrap tape (duct tape, maybe??) around their straps for I'm assuming added strength