 Complete the following phrase:  Ro-60 was on the surface southwest of Wake at around 16:00 local time on 21 December 1941 when a U.S. Marine Corps F4F Wildcat fighter of Marine Fighter Squadron 211 VMF-211 attacked her, strafing her and dropping two bombs. Ro-60 crash-dived, but the attack damaged her periscopes and several of her diving tanks. After she resurfaced that night and her crew inspected her damage, her commanding officer decided that she no longer could dive safely. The 