Submarines are way worse, and then you die if you screw it up.

[Submarines are scary. Water in general is scary, a fear which he didn't really have until recently, and something he's not going to think about any further than that and so he immediately distracts himself with adjusting the hose. He lines it up with the water as directly as possible, then contemplates the switch.]

Stand back just in case?

[And, after giving her a few seconds to move, he goes ahead and flips the switch.

...And it's just normal suction. Like a big vacuum cleaner. He flips the switch back off.]

So much for that. Guess we are gonna' have to figure out how to move this thing.