A new dynamic model of the variable-length cable used in a vertically tethered underwater drill rig is presented in this paper. which also includes the dynamics of its fixed-length counterpart. First. the differential equation of the variable-length cable is derived through the theorem of linear momentum. https://www.roneverhart.com/2-Tier-Cardboard-Cupcake-Stand-with-White-Pink-Sweet-Shop-Design-Colorful-Candy-Themed-Dessert-Cart-Display-for-Pastr/