PITTSBURGH — A submarine memorial on the USS Requin will be hosted Sunday by the Carnegie Science Center.

The ceremony will be from 10 to 11 a.m. Sunday on the sub which is moored along the Ohio River at the science center.

Veterans of USS VI Requin Base will host a memorial ceremony aboard the Cold War-era submarine. They will toll a bell once in memory of each submarine on “Eternal Patrol” and will cast flower petals on the water so that they may “travel down the rivers of this great nation to the oceans” where fellow submarines are at rest.

The Marine Color Guard from Three Rivers Leatherneck Detachment 310 and the VFW Post 9199 Honor Guard will perform a 21-gun salute.

After the service, visitors are invited to tour Requin.

The event is free and open to the public. Admission to the submarine is free all day.