Late in the day, on 27 April, as she passed between Akuseki Shima and Takara Shima in the northern Ryukyus, she made contact with a Japanese plane. The harbinger of a prolonged coordinated holddown attempt. The next morning, finding her adversary of the night before replaced by two "Settles," the submarine, low on air and battery power, sent a message indicating that she would have to surface and fight it out if the situation did not improve before noon. A little more than an hour later, 10 American fighters from Okinawa appeared and routed the Japanese planes. Friendly air cover remained with the submarine until she recharged her batteries and filled her air flasks. She then proceeded independently to the Marianas, arriving at Guam on 4 May.