Salvos and spreads were also launched to strike tough targets multiple times to ensure their destruction. The TDC supported the firing of torpedo salvos by allowing short time offsets between firings and torpedo spreads by adding small angle offsets to each torpedo's gyro angle. Before the sinking of South Korea's ROKS "Cheonan" by North Korea in 2010, the last warship sunk by a submarine torpedo attack, the ARA "General Belgrano" in 1982, was struck by two torpedoes from a three torpedo spread.