"Springer" and "Trepang" contacted three targets on 30 April. The morning was very foggy, and the submarines decided to make a surface attack. Just as "Springer" reached a favorable firing position around noon, the fog suddenly lifted and left her exposed to a destroyer escort crossing her stern. The escort turned toward the submarine with all guns firing. "Springer" submerged, went deep, and rigged for silent running. Soon the first of 27 depth charges came down, and all were uncomfortably close. Speakers were knocked off the bulkhead, bulbs were smashed, and valves were lifted off their seats. When all was quiet, the submarine surfaced for a look as the fog closed in again. One more explosion was heard as "Trepang" sank the cargo ship "Miho Maru".