📜 Labyrinth-like network of tunnels under Odesa, Ukraine, mostly from limestone mining. 🔍 One of the world's largest urban labyrinths, spanning up to 2,500 kilometers. # Why Go 🌍 Explore the largest catacomb system globally 🕵️‍♀️ Discover hideouts of WWII Soviet partisans and smugglers 🗿 See mummified bodies and partisan weapon caches 🚶‍♀️ Join professional expeditions for multi-day underground treks # Why Avoid ⚠️ Extremely dangerous to explore on your own 💀 Risk of getting lost and dehydration, as demonstrated by past incidents 🚫 Only a small portion officially open to the public # Tips Hire professionals for guided tours outside the official museum. Visit the 'Museum of Partisan Glory' in Nerubayskoye for official access. # Cost 💰 Professionals can be hired for 250 UAH per person, cost varies by route and time.