Which class has a double hull design?

• A. Borei class.
• B. Varshavyanka class.
• C. Akula class.
• D. Yasen class.

Answer: (C)

Double hull means there are two distinct hull layers: an outer hydrodynamic hull and a separate inner pressure hull. This setup provides extra buoyancy margin, improved damage tolerance, and depth capability because the pressure hull can withstand water pressure independently of the outer shell, while the outer hull can absorb impacts and provide buoyancy reserves.

The Akula class is the one known for this construction, with a true double-hull arrangement that houses the inner pressure hull inside the outer hull. That design choice is what distinguishes it in discussions of double-hull submarines. The other classes are described with different hull philosophies, so they aren’t the classic double-hull example.