🚢 Cable Laying: Catenary, Touchdown Tension, Layback and Slack (2D side view)

Side view of a cable lowered from a ship to the seabed. Set water depth, cable weight in water, horizontal tension at touchdown, ship speed and breaking load, and read the catenary shape, layback, top tension, top angle, slack ratio and safety factor. Closed-form catenary against numerical arc length and a force balance, with four in-page numerical checks.