Abstract: A line-handling retrofit kit for improving a submersible conveyance includes a mounting skid, a pair of storage containers, respective pliable caps for the storage containers, a line, and a hook configured to be held in a gripper. A respective pliable cap covers a mouth of each storage container and applies a drag on the line passing through an aperture in the respective pliable cap. The pair of storage containers are symmetrically arranged on the mounting skid with an in-between space. The in-between space aligns with an opening in the mounting skid and enables sensing through both the opening and the in-between space. The line is storable within the storage containers. The line has a first and second end, with the first end affixable to the submersible conveyance or the mounting skid. The hook is affixed to the second end of the line.