At 05.52 hours on 13 April 1942 the unescorted Empire Amethyst (Master Geoffrey Durbridge Potter) was hit on the starboard side underneath the bridge and aft by two G7e torpedoes from U-154 while steaming on a zigzag course at 11 knots about 150 miles north-northeast of Aruba. The U-boat had chased the ship for almost 16 hours before reaching a favorable attack position and firing the torpedoes from a distance of less than 500 meters. The tanker immediately caught fire from stem to stern and broke in two after an explosion in the stern. The aft part sank after 5 minutes and the rest of the wreck 10 minutes later, leaving a large patch of oil that was seen to burn for two hours. The master, 40 crew members and six gunners were lost.