K XIV-class boats combine range, speed, and heavy torpedo firepower

The K XIV class reached about seventeen knots surfaced and nine knots submerged while carrying eight 21-inch torpedo tubes, including traversing external mounts. K XIV and K XV survived the war after extensive Far Eastern patrol and raiding service. Their sisters met several different threats: K XVII struck a mine, K XVI was torpedoed by I-66, and the Japanese raised K XVIII for an air-warning role before HMS Taciturn sank it in 1945. The class combined strong performance with a combat record shaped by severe Pacific attrition.