The two from the Mirai arrange for a tanker loaded with fuel and provisions to rendezvous with the destroyer. But Lt. Tsuda, having recognized Kusaka and realizing something odd is afoot, has found out about the ship. After being informed of the fisherman's discovery of a hidden Japanese warship in Anambas, he realizes that his encounter with Kusaka, mysterious purchases of fuel and foodstuffs on the black market, the unexplained "special mission" involving the tanker, and his mission regarding the mystery ship are all connected. He has the tanker’s crew replaced with his own men and confronts Kusaka after the ship sets sail.