There are many ways to manufacture a cable, and there is no standard design to which all vendors will necessarily adhere.
Subsea power cables for oil and gas applications are typically composites, comprising multiple components such as HV/LV power cores, fiber optic bundles, hydraulic or instrument air hoses, etc. This article mainly deals with composite HV power and fiber-optic communications cables in offshore oil and gas applications. For this reason, the focus is on solid polymeric insulated cables, and oil-filled, gas-filled, and paper insulated cables are not discussed.