The submarine then began looking for the rest of the convoy, caught up with it well after dark, and fired her remaining torpedoes, but none scored. She then headed back to Darwin for more, and stood out to sea again on 15 March with a fresh supply. Three days later, she emptied her bow tubes while attacking a small convoy, but all six either ran under their targets or missed wide of their marks. The inevitable depth charge barrage followed, but proved to be equally ineffective. When Bowfin attacked again later that day, she launched four torpedoes – all of which were wasted.
