 Nagato was selected to participate as a target ship in Operation Crossroads , a series of U.S. nuclear weapon tests held at Bikini Atoll in mid @-@ 1946 . In mid @-@ March , Nagato departed Yokosuka for Eniwetok , but her hull had not been repaired from the underwater damage sustained during the attack on 18 July and she leaked enough that her pumps could not keep up . The ship had a list of seven degrees to port by the time tugboats from Eniwetok arrived . She reached the atoll on 4 April and Bikini in May . 
