As South Korea summons its reserve forces, it will have to establish new bases and camps to train and organize them. The actual makeshift war bases are unknown, but the massive Olympic Stadium could be selected as one of the bases due to its cultural significance and vast facilities. This would offer the opportunity for the North Korean forces to carry out a massive attack, perhaps with an improvised explosive device, from inside the stadium. Amid the confusion of mustering, it would be easy for North Korean special forces to blend into the reservists and place military-grade, or ammonium nitrate, explosives under the bleachers, where excited soccer fans once enthusiastically cheered "Daehan minguk!" in an otherwise normal world. The North Koreans would be aided by their shared ethnic and linguistic heritage with their southern neighbors. Although the North's dialects have now diverged from the South's - with Russian and Korean terms substituted for English ones and a distinctly different accent - it doesn't take a particularly proficient actor to sound like a South Korean.