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LOCAL – Drains that take water out of the enclosures were responsible for the seal drowning . This ladder leads to a floor drain in the *** polar bear tanks with debris caught at the top screen . Zoo officials says seal was caught near a side drain . The remaining seal swims alone in an adjoining pool as seen through the underwater viewing area Tragedy has struck the Assiniboine Park Zoo as one of the harbour seals has drowned.The drain where the seal drowned is said not to be visible from the public area . "The death of an animal is always hard and this is no exception," director of zoological operations Dr. Brian Joseph said in a statement. "The harbour seals have been a great addition to the zoo and we know our visitors and volunteers will also be grieving this loss."According to the zoo, the harbour seal became engaged with an underwater drain and was unable to free itself. The seal was one of two blind seals the zoo received from the Vancouver Aquarium this past summer. NOV. 25 2014 / KEN GIGLIOTTI / WINNIPEG FREE PRESS