A crash involving an Offshore Heavy Transport ship did more than $60m in damage to Huntington Ingalls' Mississippi shipyard and an under-construction US Navy warship, a lawsuit filed in federal court last week alleges.

The suit accuses the 64,900-dwt Hawk (built 1989) of losing control as it delivered a floating drydock to the US shipbuilder's Pascagoula, Mississippi facility 29 March, hitting a test barge, then the USS Delbert D Black.