The division reversed course to intercept; and, at 01:27, "Waller"'s radar picked up the target just off the northeast coast of Ponson Island. Firing all batteries that would bear, the destroyer steamed directly for the submarine—passing the word to "stand by to ram." Countermanding this order at the last minute because the submarine looked like she was already severely damaged, "Waller" instead continued to pump 40-millimeter and 5 inch shellfire into the enemy submersible which attempted a weak and ineffective return fire with her deck guns. At 01:45, as "Waller" doubled back for a second pass, the submarine's bow rose up towards the sky; and she sank, stern first.