The boardwalk just assembled, to provide the ants a means to reach the ventilation pipe. Photo taken on 18.09.2016 (Wojciech Stephan).

  Part of: Rutkowski T, Maák I, Vepsäläinen K, Trigos-Peral G, Stephan W, Wojtaszyn G, Czechowski W (2019) Ants trapped for years in an old bunker; survival by cannibalism and eventual escape. Journal of Hymenoptera Research 72: 177-184.