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Rome, It - July 18, 1985 - The arena of the Colosseum measuring 83 meters by 48 meters, comprised a wooden floor covered by sand, covering an elaborate underground structure called the hypogeum.

Little now remains of the original arena floor, but the hypogeum is still clearly visible. It consisted of a two-level subterranean network of tunnels and cages beneath the arena where gladiators and animals were held before contests began.

Eighty vertical shafts provided instant access to the arena for caged animals and scenery pieces concealed underneath. Platforms, called hegmata, provided access for larger animals.

At least twelve different phases of construction can be seen.

The hypogeum was connected by underground tunnels to a number of points outside the Colosseum. Separate tunnels were provided for the Emperor and the Vestal Virgins.

Elevators and pulleys raised and lowered scenery and props, as well as lifting caged animals to the surface for release.