The World Around Us

Sesmic-reflection profile of the bed of Lake Cheko showing a possible high-density object about 39 feet (10 metres) deep.

Sesmic-reflection profile showing a strong refective surface at about 39 feet (10 metres) suggestive of a high-density object (marked T). It is below a finely layered sequence representing recent sedimentation.

Credit: University of Bologna http://www-th. bo.infn.it/tunguska/gallery.htm