They were pulled up through a small shaft after 69 days underground.

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Human marines will want to avoid being bottled up in a small hallway or shaft, while Aliens will definitely want to steer clear of large warehouses, where their lack of long-range weapons makes them the most vulnerable.

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Kuzar said the fifth hole would be tested for oxygen, and a camera may be lowered down the shaft, although the small amount of space may limit its usefulness.

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It's a New York institution, open since 1892, and the worn, subterranean spa has a Spartan look and feel imagine a small town aquarium crossed with a mining shaft.

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And from there, a small little path going down a hill that leads to a mine shaft.

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"This is one of the most significant discoveries - quite small in extent but highly significant because of its data and what is represented in the shaft, " he told BBC News.

BBC: Science & Environment