At the construction of the underwater tunnel in Świnoujście, after finish of main tunnelling, focus is not in excavation of emergency exits. For this work, ground had to be frozen due to soil situation.

https://inzynieria.com/tunele/tunel_w_swinoujsciu/wiadomosci/64150,swinoujscie-rozpoczeto-przebijanie-obudowy-tunelu,zobacz-nasz-serwis-specjalny-tunel-w-swinoujsciu