[So serious. Nagisa can't help but grin, actually; if there's one thing he is truly not afraid of, it's being bored to death. And the weird, evasive way Dirk is talking makes Nagisa roughly five to ten times more curious about it than he would be otherwise.

In other words: baby has some scuba gear, bro. Baby might still drown, but he will drown completely without fear – though perhaps not without regret.]

My hobbies – you think? Even if my favorite hobby is something really boring, like researching things?

[He's not lying.]

I like researching everything, including other people's hobbies.