Throughout 1998 there had been several incidents involving North Korean infiltrators attempting to land on along the South Korean coastline. In the June 1998 Sokcho submarine incident a North Korean submarine was found in South Korean waters off Sokcho entangled in fishing nets, the submarine was towed to a ROK Navy base and when opened the crew were all dead in an apparent murder-suicide. Another infiltration occurred in July when a dead commando and abandoned infiltration craft was discovered near the city of Donghae.