The waters around the Korean peninsula are relatively shallow, which favors the employment of quiet conventional subs. South Korea now operates seven Son–Won II–class diesel-electric submarines, powered by a hybrid diesel‐electric/fuel cell with air-independent propulsion technology. These subs are extremely quiet; they can travel up to 20 knots when submerged and remain under water for seven weeks. … Continue reading South Korea does not need nuclear submarines (very like Australia!)