Casey James Fury, of Portsmouth, N.H., was a civilian worker painting and sandblasting inside the USS Miami, a Los Angeles class nuclear submarine based out of Groton, Conn.

The sub was undergoing maintenance work in Kittery, Maine at Portsmouth Naval Shipyard.

From AP:

The civilian painter and sand blaster told authorities that he needed to go home because he was suffering from an anxiety attack and had no more vacation or sick leave.

He said he never envisioned such extensive damage when he used a lighter to set fire to a plastic bag of rags that he left on a bunk in a state room.