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The tentacle's body encountered at the bottom of the chasm is somewhat squid shaped, with three stumps that appear to have been severed. Indeed in Half-Life, after the first tentacle encounter, the player travels through the chasm the creature had occupied. Typically several tentacles use the same pit, suggesting that they may be appendages of a larger organism. Often they make long, low frequency vocalisations, that sound somewhat similar to the songs produced by whales. They usually emanate from pits, into which they can retract when injured or in danger. Tentacles also need to live in a pit or trench.
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Tentacles usually need ome sort of liquid at their base to keep them alive. This "eye" appears to be a sensory organ, although the creature only reacts to sound and surface vibrations, implying that the race is blind. A large, green, segmented stalk supports a "head," which ends in a sharply pointed, bladelike appendage and features what looks like an eye. Physically, the tentacles have a bizarre appearance.
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