Semi-Submarine Experience – The sunset cruise. In the late afternoon, get on a semi-submarine and watch the beautiful fire sky around the beautiful Bawe Island. Bawe Island is in the middle of the Indian Ocean, west of Stone Town, which is the city of Zanzibar. When it gets dark, the ship’s LED lights make it possible to see the seabed in a more realistic way. The ship that is part submarine stays afloat, but there is room below the water that has underwater windows that let you see the reef from your seat.