A semi-submarine boat activity typically involves a vessel that has a submerged hull that allows passengers to view marine life and underwater scenery without the need for diving equipment. The boat typically has a deck above the waterline, where passengers can sit or stand, and a lower level that is partially submerged in the water, with large windows or plexiglass viewing areas that allow passengers to see underwater. During the activity, the boat will typically take passengers to areas with interesting underwater features, such as coral reefs, shipwrecks, or areas with abundant marine life. Passengers can then view the scenery through the windows or plexiglass viewing areas, while a guide provides commentary and points out interesting features and marine creatures. Semi-submarine boat activities are a popular way to explore the marine environment, especially for those who are unable or unwilling to dive or snorkel. They are often offered as a tourist activity in areas with clear, shallow waters and interesting marine life, such as tropical destinations or areas with coral reefs.

The boat start to move to a location where there are interesting marine features, such as a coral reef or a shipwreck. Along the way, a guide will provide information about the local marine life, the area's history, and the boat's technology. Once the boat reaches the destination, passengers will be able to see the underwater scenery through the windows or plexiglass viewing areas, while the guide points out interesting features and marine creatures. The semi-submarine boat typically moves slowly, allowing passengers to take in the sights and take photos. During the activity, passengers may see a variety of marine creatures, such as colorful fish, sea turtles, and possibly even larger creatures like sharks or rays, depending on the location. Passengers may also have the opportunity to feed fish or participate in other interactive experiences. The semi-submarine boat activity usually lasts for a couple of hours, and after returning to the starting point, passengers can disembark and share their experiences with others. It's a unique and exciting way to experience the beauty and diversity of the underwater world without getting wet.

Andaman is a great place to experience a semi-submarine boat activity. The waters around the Andaman Islands are known for their crystal-clear visibility and abundant marine life, making them an ideal location for underwater exploration. The semi-submarine boat activity is a popular tourist attraction in Andaman, with several operators offering this experience. Some of the best locations to explore through a semi-submarine in Andaman include the Mahatma Gandhi Marine National Park and the North Bay Island, where you can see colorful coral reefs and various species of marine life.