Figure 2 from: 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. https://doi.org/10.3897/jhr.72.38972

Figure 2 The upper part of the ant trail in Fig. 1; the ants (on the left) were unable to move along the ceiling and thus could not reach the outlet of the ventilation pipe. Photo taken on 18.09.2016 (Wojciech Stephan).