Have you ever been underwater diving? I wonder how people breathe for a long time 
I've done SCUBA diving before. I'm actually a rescue diver for my fire department too! I snorkel a lot as well. You?
Oh wow that sounds like fun! How long does the oxygen tank last on that? and where do you do your diving at?
There are different sizes of breathing tanks, depending on the dive. We have a big river and a bunch of quarries nearby that I most frequently dive in. I've done ocean though too. 
Do you see any sea animals while diving? Have you ever had an interaction with a shark?
Nothing much besides fish. No sharks in this area, which I'm glad for. The movie Jaws made me scared of the ocean as a kid! You ever see that movie or read the book?
I saw the movie but i never read the book! I never knew their was a book! Was it similar to the movie?
The novel came out the year before the movie. The book was okay, but Spielberg really made you fear the shark in the movie. 
Yea, that shark was very scary!
Spielberg really has a way with making animals scare you. Jurassic Park had the same effect on me, and I loved dinosaurs as a kid.