( CNN ) -- The fire started aboard the USS Miami while the sub was in dry-dock . It took firefighters 12 hours to extinguish , and caused at least $ 400 million in damage . Shipyard worker Portsmouth admitted to one counts of arson . He could have faced life in prison .
The fire started aboard the USS Miami while the sub was in dry-dock . It took firefighters 12 hours to extinguish , and caused at least $ 400 million in damage . Shipyard worker Portsmouth admitted to one counts of arson . He could have faced life in prison .