Normally, U.S. Navy submarines are dry docked every five years while on active duty. If permanently moored in fresh water the maintenance interval can be extended to 25 years. On 30 September 2020 The "USS Cod" announced that they needed more donations so she can be sent to Erie, Pennsylvania for dry docking to repair and renew her underwater hull. The last time the "Cod" was in dry dock for repairs was in 1963 in Lorain, Ohio. "Cod" will be closed to tours for approximately 60 days in the spring of 2021 for a dry dock maintenance program. The goal of the project is to conserve and restore the underwater hull of this 78 year old submarine so that she will continue to be a well-preserved National Historic Landmark and memorial for naval veterans. Upon completion of the shipyard maintenance project Cod will return to the 1201 North Marginal Road berth she has occupied since her arrival in Cleveland in 1959.