On 9 February, as the Japanese were taking Makassar, "Saury" departed Surabaya for her second war patrol. The submarine headed east to patrol along the north coasts of the Lesser Soendas. On 13 February, she headed north-northwest for a three-day patrol between Kabaena and Salajar off the Sulawesi coast. From there, she moved southwest to patrol the entrance to Lombok Strait. On the night of 19 and 20 February, she received word of the Japanese landing on Bali; sighted her first enemy ships of the patrol; and commenced 18 hours of submerged evasive tactics to avoid enemy destroyers' depth charges. On 24 February, she shifted northward to an area southeast of Sepandjang Island where she sighted and attacked, unsuccessfully, an enemy convoy.