A fire early Wednesday aboard the aircraft carrier museum Midway drew a three-alarm response from local fire departments.
The fire, which officials said was apparently caused by a spark from a welder's torch, was reported about 5 a.m. as workers were converting a space below decks to accommodate an expansion of the museum's overnight program for students.
"We're OK," museum officials announced on Twitter. "Tx u to San Diego Fire Department for the incredible response this morning. Everyone is fine."
Firefighters from several departments responded to the blaze. Officials said the departments train aboard the Midway to learn how to deal with the intricacies of fighting a fire aboard a ship.