Revealed: The deeper they check underneath Fukushima plant, the higher contamination levels get 福島原発地下、深ければ深いほど、放射能汚染濃度が高い！

(Source) http://enenews.com/revealed-the-deeper-they-check-underneath-fukushima-plant-the-higher-contamination-levels-get-now-sampling-over-40-feet-below-surface#

Now sampling over 40 feet below surface

Title: Cesium levels in water under Fukushima No. 1 plant soar the deeper it gets, Tepco reveals
Source: JIJI, Kyodo
Date: Aug 1, 2013

Cesium levels in water under Fukushima No. 1 plant soar the deeper it gets, Tepco reveals [...]

Tepco found 950 million becquerels of cesium and 520 million becquerels of beta ray-emitting radioactive substances, including strontium, in the water from 13 meters [~43 feet] underground.

Water from 1 meter down contained 340 million becquerels, and a sample from 7 meters down contained 350 million becquerels.

[...] Cesium, a metallic element, is subject to gravity. [...]

See also:  
Official reveals contamination levels at Fukushima plant are likely higher outside reactor units than inside