I always found it funny how scuba divers need to adjust their buoyancy control device to account for their flatulence.. Like if you are perfectly neutral and you fart you will start to noticeably sink if you dont readjust your buoyancy controls.
@freemo I seem to remember the need to adjust the BCD was a problem before getting breathing under control, granted, farting could give you some propulsion.
@modrobert Yea, breathing effects your boyancy too. The BCD cant really correct for that though since it changes on every breath.