Hulk turns out to be a superhero who doesn't really need oxygen, because the Hulk's body can adapt well to the surrounding environment, both when he is fighting or doing something.
Thanks to a gland that would develop in his body whenever the Hulk was underwater, the Hulk could keep oxygen in his lungs even in water while avoiding decompression. This surprised Banner as he realized all of those years the Hulk held his breath were unnecessary.
The Hulk has a rather unknown ability in breathing underwater, which he's able to accomplish due to a gland in his body that creates oxygen to fill his lungs with.
Self Sustenance: Presumably from wherever the Hulk's superhuman energy to create his extra mass, the Hulk's physiology allows him to survive indefinitely without food, water, air or sleep after he has adapted.
On more than one occasion, Hulk has fallen from a moon down to a planet without being harmed. Any. He's fallen from orbit in the past, and that means hitting terminal velocity, and he's walked away from that. It's even happened on other planets so there doesn't seem to be a upper limit of how far he can fall.
Morning Joe [6AM] 11/30/23 | 🅼🆂🅽🅱🅲 Breaking News Nov 30, 2023
What is the Hulk's weakness?
Weakness: ADAMANTIUM AND VIBRANIUM
Swords, knives, and more have been used against Hulk and almost none of them even leave a scratch or mark on him. However, with that said, there are two bladed weapons that can cut into Hulk's skin. Adamantium is something that can cause damage to Hulk.
This reveals two things – first, that the Hulk is impervious to being bitten by a zombie; second, that Banner will automatically be protected by the Hulk regardless of whether or not he's expecting an attack. This suggests that both aspects of his personality would survive the apocalypse.
Hulk goes up against Thanos in a fight but is defeated by the Mad Titan. Though it ultimately wasn't surprising that Thanos would beat Hulk, it was shocking to see the easy fashion that he did it in. It could even be assumed that Thanos used the Power Stone that he had.
In Immortal Hulk #39 by Al Ewing and Joe Bennett, Hulk travels to the Below-Place where Bruce Banner is ripped from his body by the One Below All. Not only that, but the abuse Hulk's body suffers while in this hellish realm sucks him dry of nearly every bit of gamma energy flowing through his veins.
There's no question the Hulk is a near-indestructible force who comes out on top in almost all of his battles of pure strength. However, against Superman, he's outmatched. While Hulk's strength might rival that of the Man of Steel, Superman's other abilities give him a considerable edge against his opponent.
Yes, The Hulk can survive a nuclear blast at ground zero. In fact, nuke & gamma bombs and the like are used against him quite often. Here are few times the hulk has had massive explosions used against him. From his early days of comics to his more recent events.
The soft-spoken scientist's blood is infused with gamma radiation, allowing him to transform between being a human and being a ferocious green machine. However, it's possible that the gamma radiation in his blood also prevents him from being able to have a child with someone.
Banner's plan seems even more reckless than usual. First of all, as he admits, there is no guarantee that this will kill Hulk. The Immortal Hulk series has established that the Hulk is functionally immortal, and he can survive even after Banner dies, which is exactly what scares the scientist.
Due to the gamma radiation that birthed him, his skin is nearly indestructible and takes massive force to break. Throughout Hulk's many on-screen fights, he has only bled twice, and both circumstances prove it takes a unique set of variables to accomplish that.
Despite his immense power, the Hulk has been defeated by heroes like Wolverine, Iron Man, Puck, and the Punisher. Spider-Man, Fantastic Four, and the Thing have also managed to take down the Hulk using their intelligence, teamwork, and unique abilities.
When it comes time to collect the Power Gem, Thanos is forced to battle a brute who unwittingly uses the Gem to increase his strength to near immeasurable limits. While fighting the being known as the Champion, Thanos makes a comment that tells fans he is and has always been afraid to fight the Hulk.
Although these mighty Avengers have fought nearly 40 times in the comics, almost every match has resulted in a draw. Of the battles where there is a clear winner, the final tally gives Hulk a victory of winning a mere three fights over Thor's two.
Hulk's inhibitor appears to reverse whatever mind and body meld that led to Smart Hulk's creation. Of course, She-Hulk also reveals that this is not a permanent switch. Bruce Banner is only human again for a short amount of time, allowing his blood to help create She-Hulk.
This Hulk even ripped Wolverine in half in one comic book storyline. The Planet Hulk and World-Breaker Hulk storylines saw the Jade Giant almost completely obliterating all the Marvel heroes, even the Sentry. The Hulk is one character Deadpool can't beat.
The loss of Mjolnir is what prohibits Thor from being able to defeat Hulk in battle. In fact Hulk uses this and two other flaws Thor has against him, causing only one time where Hulk and Thor duke-it-out and the victory going to Hulk.
