Thirty-three military sailors assigned to USS Michigan at Puget Sound Naval Shipyard were hospitalized Monday after possible exposure to exhaust from the vessel’s engine. 

A spokesperson with the Bangor-based Submarine Group 9 told Fox News that, “out of an abundance of caution,” the sailors were directed to a local hospital for an evaluation.

A Washington State Ferry traverses past the city skyline through Puget Sound as seen from the Vigor Shipyard in Seattle, Washington, U.S., on Friday, April 18, 2014. 

A Washington State Ferry traverses past the city skyline through Puget Sound as seen from the Vigor Shipyard in Seattle, Washington, U.S., on Friday, April 18, 2014. 
(Meg Roussos/Bloomberg via Getty Images)

“The Navy and the Submarine Force take the health and the safety of our sailors very seriously,” the spokesperson said. 

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Two sailors reported “mild symptoms for acute respiratory distress. The other sailors did not report any symptoms. They’ve since been released from the hospital, the Kitsap Sun reported. 

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The USS Michigan has been docked at the Puget Sound Naval Shipyard in Washington state undergoing what’s known as an “Extended Refit Period,” since July 2019.