There is nothing reassuring about a cave with a name like Hell Hole, and even less comfort in the fact that its doorway is now protected by a steel-and-concrete structure called the “Mailbox,” an unmissable, heavily graffitied barrier with a narrow slot designed to stop anyone who isn’t the right size from attempting the descent. Tight as it is, the slot is still only a preview. Veteran cavers warn that the narrowest points beyond it are even tighter, and if a person struggles at the entrance, they should turn back.

But the Action Adventure Twins aren’t built for turning back. The identical brothers, James and Edward, are known online for exploring some of America’s most dangerous and remote cave systems, creating viral videos of their underground expeditions across YouTube and social me

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