A seal was found swimming around in the Charles River on Monday.

Workers at the Museum of Science first saw the seal 10 days ago. Since then, New England Aquarium staff have been trying to find him again and succeeded with the help of some dam operators.

Aquarium workers said the seal probably snuck through a dam under the Zakim Bridge trying to chase a school of fish. The dam operators opened the gate so the seal could swim back to the harbor.

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