Changes

Kill all the Stingers if you wish. Land on the pressure switch with your Iron Boots and stay there until the water level stops changing. Turn to face directly at the exit door and move to the front edge of the switch in preparation. Take off your Iron Boots and swim rapidly forwards, tapping B, towards the edge you're trying to reach. You will be delayed slightly by a bit of wall, don't worry, keep swimming. You will float up as the water level drops, and ultimately grab the edge you're aiming for as if by magic.

Kill all the Stingers if you wish. Land on the pressure switch with your Iron Boots and stay there until the water level stops changing. Turn to face directly at the exit door and move to the front edge of the switch in preparation. Take off your Iron Boots and swim rapidly forwards, tapping B, towards the edge you're trying to reach. You will be delayed slightly by a bit of wall, don't worry, keep swimming. You will float up as the water level drops, and ultimately grab the edge you're aiming for as if by magic.