Deep Down's patent pending SDB System utilizes a unique mudmat and cartridge layout that allows for installation of hydraulic flying leads, electric flying leads, gas lift jumpers and other subsea equipment from the seabed, thereby eliminating the need for expensive, surface-based installation equipment. The SDB System is particularly attractive for installations in remote locations where vessel availability may be limited or in cases where there are multiple flying leads or jumpers to install.
A couple comments on your photos. the only place we have see those spindles before is on any device, spool, or carousel that spins on a HDU.
Then why isn't this one round? What if the material to be wound on it, is such a length and diameter that you would need a carousel diameter of 16 feet? Would the total package fit under highway overpasses? Would it make it through construction zones?