The Guam Shipyard is trying to determine whether its large dry dock was damaged after it took on water and partially sank over the weekend.
Guam experienced high surf because of a weather system near Japan.
As of Monday, shipyard employees were removing the water, after which a comprehensive damage assessment will be conducted.
In a statement, the shipyard administrative manager Marie Camacho did not provide additional information about how the dry dock started to sink or why water might damage it.
There was no ship in the dry dock at the time.