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This is the mysterious moment an unknown, alien-like animal CHEWS through a metal cage.

The video - uploaded onto YouTube from a user based in China - shows the creature aggressively gnawing its way through the cage after it was discovered in the Shenzhen Reservoir in China's Sand Bay.

It had apparently been swimming and was fished out of the water by workers for the Department of Drainage.

The man who uploaded the video - Raymond Yeung - claims the animal could be a mythical 'water ghost'.

Footage of the creature finishes before we can see if it escaped to freedom.