The submarine will operate from upcoming expedition yacht Scenic Eclipse in August.
Offering eight dives a day, the vessel can reach depths of up to 300m with seating for up to six guests and a pilot. Passengers’ seats can swivel 280 degrees to take in underwater views from both sides of the craft.
The submarine’s acrylic spheres are constructed from a material possessing the same refraction index as seawater, meaning the ship "visually disappears" under the ocean providing a "very open and spacious feeling", Scenic said.
Multiple safety aspects have also been incorporated into the design and include features such as automatically resurfacing in the unlikely event of a power outage.
Scenic Neptune pilot Remy Izendooren said: “Guests will embark on an awe-inspiring adventure to the underwater world. Volcanic pinnacles, sheer walls, majestic wrecks, a wide diversity of marine life and beautiful reefs lie waiting to be discovered.
"The world has many spectacular dive sites waiting for us to explore, from sunken wrecks and vibrant tropical reefs to a sea floor teeming with life in Antarctica.”
You can take a 360-degree tour of Scenic Nepture below:
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Scenic and Emerald Waterways provide a complete "one-stop shop", offering two complementary brands designed to make selling river cruising plain sailing.