How to Be Under Water Without Air and Without Being Able to See

i don't have a fear of the water, but i flagged it as something that might be a problem caue. Andyes, all they've been doing, yes, theyare racing go carts when they're like, seven. What are some other weird things you've learned how to do? It can be really random. Like like the born supremacy, that sen whereshe gets shot, the car goes off a bridge into the water. So i had to shoot a scene under water where i was in a car under water, and i had to swim upside down and get air in the little corner pocket. Theother thing is, you're ging to get in a water tank