Ian Rolland was 4,500 feet underground, exploring the deepest cave in the world, when its clear something has gone wrong.

Bill Stone and the rest of the team are in the cave, but with no way to talk to Ian; they have to trust the experimental technology made by Bill, and continue further down into the deepest cave in the world.

Even the slightest mistake could be fatal, they are almost 1 mile underground after all...

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