South Korean survivors arrive as they are surrounded by relatives and media at a port in Incheon, west of Seoul, South Korea, Wednesday, Nov. 24, 2010. South Korea's troops were on high alert Wednesday as their government exchanged threats with rival North Korea following a frightening military skirmish that ratcheted tensions on the peninsula to new extremes. (AP Photo/ Lee Jin-man)

Photo by: Lee Jin-man

South Korean survivors arrive as they are surrounded by relatives and media at a port in Incheon, west of Seoul, South Korea, Wednesday, Nov. 24, 2010. South Korea's troops were on high alert Wednesday as their government exchanged threats with rival North Korea following a frightening military skirmish that ratcheted tensions on the peninsula to new extremes. (AP Photo/ Lee Jin-man)