As well as simply being insanely strong and extremely durable and resistant to damage, the Hulk is also ridiculously adaptive to almost any given situation. As well as having a generic healing factor similar to that of Wolverine's (if he is cut or physically damaged in any way, the wound will heal almost instantly), the Hulk has also proven to be able to adapt to the vacuum of space, whereby he has developed an ability to breathe there whilst stranded there - and the same can be said of his body in underwater situations. Most impressive (or most annoying, depending on how you look at it), however, is his ability to adapt from death itself. In Hulk: The End, after everyone on Earth had died in a nuclear war, Hulk was the only person remaining. He tried to kill himself several times, but he just wouldn't die. Then, after 200 years of wandering around alone, a group of irradiated mutant cockroaches attacked him and ate him alive - but he came back to life. What a bummer.
