Quote from P.JMan:
the block doesn't matter, the Super Missile still goes through the gate, the water doesn't matter either
Argh, gonna fix this in the next update too. I never thought it would be possible in water being suitless, thanks for proving the opposite.
BlueGlass:
I think that would be the room right above the refill station. Use PBs there. And right, I got some ideas from RBO.