The wreck was depth-charged or attacked with Hedgehog mortars by the Royal Navy during World War II. A Dublin-based technical diver, Des Quigley, who dived on the wreck in the 1990s, reported that the wreck is "like Swiss cheese" and the seabed around her "is littered with unexploded hedgehog mines". These attacks may have been accidental as the wreck would have registered on World War Two active sonar (then known as ASDIC) as a possible U-boat. WW2 systems were not as discriminating as modern sonar. The wreck would have presented a good return signal and, thus, a tempting target. U-boats were so active in the Southern Irish Sea in WW2 that Britain eventually placed several deep minefields in the area - at depths where only submarines would have been liable to detonate them.