Abstract: A method and apparatus for launching, retrieving and servicing a submersible from the deck of a "mother" or tender vessel. The apparatus includes a dual pivotal frame assembly mounted upon the deck of the mother vessel and a vertically adjustable platform operable to selectively mate onto the submersible. The dual frame and platform assembly is operable to launch and retrieve a submersible within a body of water surrounding the mother vessel. A submersible handling system is mounted upon the deck of the mother vessel and is operable to controllably carry the submersible into a submersible service enclosure. A power cell service enclosure is mounted upon the deck of the mother vessel in a posture contiguous to the submersible service enclosure and is operable to withdraw spent banks of power cells from a submersible power pod and rapidly reposition a charged bank of power cells within the pod.