Y-40

Y-40 The Deep Joy is a beginner-friendly dive facility in Montegrotto Terme, Veneto, Italy—the world's deepest thermal water swimming pool, plunging to an extraordinary 42 meters depth. The pool is filled with naturally heated thermal spring water at a comfortable 32-34°C, eliminating the need for cold-water exposure gear and creating an incredibly inviting diving environment. The interior features various platforms, underwater caves, and a transparent tunnel at different depths, providing a unique architectural underwater playground. While Y-40 lacks natural marine life, it offers unparalleled training opportunities for divers working on deep certification, buoyancy skills, and freediving practice. The warm, crystal-clear water and controlled conditions make it accessible to complete beginners taking their first breaths underwater. Y-40 has become a global diving destination and filming location, proving that Italy's innovation extends even to the creation of extraordinary artificial underwater environments.