About Revisions Y-40 The Deep Joy Via Cataio, 42, Montegrotto Terme, PD 35036, Italy More Info Max Depth: 131-140ft/40-43m Average Viz: Over 150ft/46m Entry Type: Shore Bottom Composition: Rock Aquatic Life: None Spring: Over 85°F/29°C Summer: Over 85°F/29°C Fall: Over 85°F/29°C Winter: Over 85°F/29°C 6/19/2025 2:34 AM SpacemanCraig

Y‑40 is a geothermally heated dive pool in Montegrotto Terme (near Padua, Italy), reaching a maximum depth of 42.15 m — over 130 ft — and holding around 4.3 million liters of warm (32–34°C) thermal water.

It features multilevel platforms, artificial caves, and a 13 m transparent underwater tunnel for viewing dives, making it ideal for freediving, scuba training, research, and even film/video productions.

Since opening on 5 June 2014, it set a Guinness World Record and remains the world’s deepest geothermally heated pool, attracting divers, freediving champions, artists, and researchers year-round.