Which of the following is a type of submersible rig?

• A. Semi-submersible
• B. Drillship
• C. Jackup
• D. Bottle-type submersible

Answer: (D)

Submersible rigs are designed to operate beneath the water surface. The bottle-type submersible is an underwater vehicle built to work while submerged, making it the only option here that functions as a submersible rig. The other three are surface rigs: a semi-submersible floats with ballast and drills from the surface, a drillship drills from a ship at the surface, and a jackup sits on legs on the seabed above water. So the bottle-type submersible is the correct type of submersible rig.