In the serene resort area of Montegrotto Terme near Venice, Italy, lies an extraordinary marvel of modern engineering: the Y-40 The Deep Joy, the world’s deepest swimming pool.

Nestled within the Hotel Terme Millepini, this aquatic masterpiece plunges to an astounding depth of 138 feet (42 meters), deep enough to fit a 13-story building.

Since its certification by the Guinness Book of Records, the pool has attracted swimmers, divers, and thrill-seekers from around the globe, eager to experience its unique underwater world.

What sets the Y-40 apart, beyond its sheer depth, is the nature of its water.

Filled with 1.1 million gallons (4.3 million liters) of thermal water drawn from local springs, the pool offers divers an experience unlike any other. The warm water allows for dives without the need for skin suits, which would typically be required in open sea or lake dives to combat colder temperatures.

This is particularly inviting for divers who are looking to train, practice, or simply enjoy the depths without the additional hassle of thermal protection.

The thermal water maintains a consistently comfortable temperature, making it a year-round attraction.

Whether visitors are beginners taking their first plunge or experienced divers honing their skills, the warmth of the water ensures that every dive is a pleasure, free from the bite of chilly seas or lakes.

Y-40 is more than just a deep pool; it is a meticulously designed environment catering to the needs of professional and amateur divers alike.

The pool is equipped with various underwater caves and tunnels, mimicking real subaquatic landscapes, making it an ideal training ground for scuba divers.

These caves offer a controlled environment for divers to practice negotiating the complexities of underwater spaces, which are typically encountered in ocean or lake dives.

Whether preparing for exploration dives or learning new techniques, divers have the chance to experience unique scenarios in a safe and supervised setting. With different levels and depths to explore, Y-40 offers a structured yet exciting experience that pushes the limits of underwater navigation.

For those not quite ready to take the plunge, the Y-40 provides an equally mesmerizing experience from dry land.

A suspended transparent viewing tunnel allows spectators to watch as divers move gracefully through the water, navigating the pool’s depths and caves. This tunnel gives visitors a chance to appreciate the beauty and tranquility of underwater movement, providing a front-row seat to the thrilling world of diving without getting wet.

Families and friends of divers often enjoy this feature, watching their loved ones explore the depths while they remain comfortably dry. The tunnel’s crystal-clear views make for an immersive experience, allowing spectators to feel connected to the underwater action.

While the Y-40 Deep Joy is undoubtedly the star attraction, it is also part of a larger experience offered at the Hotel Terme Millepini.

The hotel is renowned for its spa treatments and therapeutic thermal waters, which have been a draw for wellness enthusiasts for years. After a day of diving, visitors can unwind and rejuvenate in the hotel’s luxurious spa, taking full advantage of the healing properties of the region’s natural springs.

Combining the thrill of diving with the tranquility of a spa retreat, the Hotel Terme Millepini offers a truly unique destination for adventurers and relaxation seekers alike.

Whether you come for the world-record-breaking pool or the soothing waters of the spa, this corner of Montegrotto Terme promises an unforgettable experience.

The Y-40 Deep Joy isn’t just a pool—it’s an invitation to explore the underwater world in a way that is both thrilling and accessible.

With its incredible depth, warm waters, and intricate underwater features, it has become a premier destination for divers around the world.

Whether you are a seasoned professional or a curious novice, this deep-water wonder is sure to leave a lasting impression, inviting you to return time and again to its welcoming depths.