Site: Japanese army WW2 underground complex/ air-raid shelter.
Source: 90 year old slave-labor survivor who worked at the site.
Area: Approximately 2.5 acres.
Location: beside a river.
Terrain of site: Flat to gently undulating.
Surrounding terrain: Flat and approximately 2 feet lower than the target site. The river is of course much lower.
Detector used: Discovery 2 box.
North to south scan: Sharp short tone every 3 feet for the entire 2.5 acre area.
West to east scan: Sharp short tone every 3 feet for the entire 2.5 acre area.
"Control" scan outside the site in surrounding property: No tones.
Loud and continuous signals: 6 clear targets. The largest was approx 5 feet in diameter.
1) Would the short sharp tones at 3 feet intervals be indicative of i-beams? The tone seems too distinct to be the usual concrete beam rebar.
2) Can anyone provide architectural plans or any diagrams for Japanese bunkers and similar below-ground constructs?
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