I didn't said I had to do it. However, even if nothing happens, I've learned something new from my research. I enjoy learning new things. So maybe the guy and I get together, and he wants to keep the diving hobby with himself and his buddies. That's fine, I'm got my own stuff. But if he asked if I was interested, I can say I've done research and yes or no on whether I want to try it or not. I could also talk halfway intelligently about it.
He was talking about diving at lunch on Saturday and mentioned having to ascend slowly. "Yes, to prevent the bends" I commented. He looked surprised and said I know my stuff. I had been really into the space program when I was in school and did a lot of reading on it. There seems to be some information crossover between diving and the space program.