The video shows the ape trying to scramble down a concrete ramp leading into the moat – but accidentally fell in.
The orangutan is seen struggling in the water before disappearing beneath the surface.
The zookeeper takes action immediately and throws in a lifebuoy before jumping straight in after the animal, and dives under the water to pull the orangutan back up to the surface.
He pulls the ape over to the ramp and drags it out of the water.
More footage shows the zookeeper performing CPR on the orangutan to revive it.
The zoo, which is home to around 3,000 animals, confirmed the orangutan survived and is now in a stable condition.
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