Ukrainians use catacombs as a bomb shelter during air raid alert in Odesa, amid Russia's invasion of Ukraine.

Locals take shelter in the catacombs using it as a bomb shelter during air raid alert in Odesa, Ukraine 29 June 2022. The catacombs in Odesa are a labyrinth-like network of tunnels and subterranean cavities located under the city and its outskirts. It is one of the world's largest urban labyrinths, running up to 2,500 kilometres, parts were used as air-raid shelters during the Second World War, as media informed.