Inky the octopus waited until it was dark and the staff had gone home from the National Aquarium of New Zealand before making his move.
He squeezed and pushed his way through a tiny gap in the mesh at the top of his tank and slithered 2 meters (6.6 feet) to the floor. Then he made a beeline across the room to a drain hole.
With a body the size of a rugby ball, Inky managed to stretch out and squeeze into the hole. From there, he shimmied down the 50-meter (164-foot) pipe until he was back in the Pacific Ocean.
All he left behind three months ago was a slimy trail, allowing staff at the Napier aquarium to re-create his amazing escape.
He's not been seen since.