Workers at the General Dynamics NASSCO shipyard are cleaning up after one of its dry docks flooded unexpectedly on July 11.

No one was injured in the incident, a company spokesman said.

The incident occurred in one of NASSCO’s two graving docks, which are depressed areas on the shipyard grounds where the company does new construction. Once work on a ship is finished, seawater is pumped into the dry dock and the ship is floated out onto San Diego Bay.

A barrier keeping water out of the dry dock collapsed, said a representative of the San Diego Fire Department. NASSCO conducted a head count, all employees were accounted for, and the fire crew that responded was not needed for a rescue, the representative said.

The future USNS Miguel Keith is in the graving dock. The 784-foot ship is the fifth in a series of expeditionary warfare ships NASSCO is building for the U.S. Navy.

“The ship is safe and in stable condition,” the company said in a statement July 13. “Personnel are currently assessing impact to the ship.”

Stock for defense contractor General Dynamics trades on the New York Stock Exchange under the symbol GD.