Abstract: The vehicle hull with an interferometric fiber-optic gyroscope includes an outer hull, an inner hull arranged within the outer hull, and an interferometric fiber-optic gyroscope. A fiber optic coil of the interferometric fiber-optic gyroscope is wound around the inner hull in a space between the inner hull and the outer hull. As a non-limiting example, the vehicle may be a dual-hull submarine, and the fiber optic coil may be would around the pressure hull of the submarine within the space between the pressure hull and the light hull. The interferometric fiber-optic gyroscope also includes a light source and an optical modulator in optical communication therewith. The fiber optic coil is optically coupled at two ends thereof to the optical modulator for receiving two counter-propagating light beams therefrom. A photodetector is optically coupled with the optical modulator for receiving a recombined light beam produced by the optical modulator.