MERGO T-SUB The Mergo tourist submarine (T-Sub) is safe and comfortable, designed for the smaller tourist resort. This submarine is ideal for start-up operations, and organisations entering the underwater market for the first time. Operating Depth 300ft (100m). Crew: One pilot and ten passengers. Weight: 24 tons. Large front viewport. Large tower viewport. Ten large individual passenger viewports. External lights, sonar, acoustic tracking, video and communications. The Mergo tourist submarine (T-Sub) will carry ten passengers and one pilot, to a depth of 100 meters in complete comfort and safety. The submarine has been extensively tested, and subsequently certified by Det Norske Veritas.