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A semi-submarine (semi-sub) is a surface vessel that is not capable of diving, but has accommodation space below the waterline featuring underwater windows.[1] The watercraft is similar to glass-bottom boats, but with deeper draft. Both types of boats are mainly used to provide sight-seeing trips for tourists in clear, calm, and often shallow, waters.
- ^ IHA, Daily Sabah with (9 June 2016). "Stay dry, explore aquatic world on Turkey's first domestic semi-submarine". Daily Sabah.