Naval Support Facility Kamiseya

Naval Support Facility Kamiseya (上瀬谷通信施設) (UIC 0557A) is a detachment of U.S. Naval Air Facility (NAF) Atsugi, Japan. The facility is located on the Kantō Plain, approximately three miles (5 km) northeast of NAF Atsugi, and 7.55 miles (12.15 km) WNW of Yokohama. The base consists of 587 acres (2.4 km²) with 110 acres (0.4 km²) within the fence line. It has 184 buildings (including three bachelor quarters and 68 housing units) and a plant property value of $100 million. Base population consists of 300 sailors, their families and personnel who work on the facility.

The western gate is open during the day to the public. It follows into a field of about 400 meters long, with a helipad in the Northern section. This area is an excellent kite flying location, though remote controlled devices are prohibited.

After World War II, this former Imperial Japanese Navy torpedo manufacturing facility was used by the United States Navy as a radio communications intercept station until it ceased such operations in the late 1990s. On September 24, 1965 a fire broke out in one of the operational buildings, killing twelve United States military personnel. Most of the deaths occurred because the men were unable to escape through a locked exit, and were overcome by the smoke. Although the official investigation listed faulty electrical circuity as the cause of the fire, some eyewitness accounts attributed it to failure in a recently-installed incinerator, used for destruction of classified material, which had been improperly vented through the wall and subsequently caused the wall to ignite.

The main operations building, in which the fire took place, was originally built underground. The walls and ceiling were made of reinforced concrete six to eight feet thick. It was theoretically bomb-proof by WW2 standards. Therefore, with no windows and few doors, a fire was especially dangerous. Many of the men who died had put on respirators, which were stored in a cabinet near the exit. Unfortunately, these were all ABC respirators, and they soon became clogged by the large particulates in the smoke.