In May 2013 the Israeli and Polish archaeologists conducting excavations near Camp III, unearthed an escape tunnel 10 metres (33 ft) long and 1.6–2 m deep in some places, beginning under the barracks of the Jewish Sonderkommando and leading toward a double-row barbed-wire fence.[21] The tunnel may have collapsed with people inside; the camp perimeter is known to have been mined. Notably, the camp records do not mention any incident of this kind. Other new findings included children identification tags from the Netherlands, and seven human skeletal remains possibly those of the Jewish work-detail shot upon the completion of the removal of genocide evidence.[2][22]