Abstract: Implementations described and claimed herein provide an underwater vehicle includes a vehicle body having a frame enclosed by a fairing. The vehicle body extends between a proximal end and a distal end and defining an interior. A nose is disposed at the proximal end of the vehicle body. The nose has a tow system configured to move between a tow position and a stow position. A propulsion system is disposed at the distal end of the vehicle body. The propulsion system includes a plurality of control fins and a thruster. A power distribution system is housed in the interior of the vehicle body. The power distribution system includes a first power system housed in a first pressure vessel and a second power system housed in a second pressure vessel. The first pressure vessel is isolated from the second pressure vessel.

Abstract: A load-bearing frame structure for a maritime vehicle includes two support plates, a deck plate structure, a front bulkhead structure, and a back bulkhead structure. Each of the support plates has a front edge, a back edge, a top edge, and a bottom edge. The support plates can be angled relative to each other and connected to each other at the top edges thereof forming an inverted V-shape. The support plates can alternately be parallel to each other in a vertical orientation. The support plates each have one or more cut-out sections. The deck plate structure connects the two support plates proximate the bottom edges of the support plates. The front bulkhead structure connects the front edges of the support plates, and the back bulkhead structure connects the back edges of the support plates.

Abstract: An apparatus includes a scrubber bed, a cooling unit operatively connected to the scrubber bed, and a frame configured for a user to carry the apparatus. The cooling unit includes a compressor, a condensing coil operatively connecting the compressor to an expansion valve, and an evaporating coil operatively connecting the expansion valve to the compressor, and a first fluid circulating through the compressor, the condensing coil, the expansion valve, and the evaporating coil. A method of cooling a gas in a rebreather apparatus includes scrubbing an exhalation gas to produce a recycled gas having a lower concentration of carbon dioxide than the exhalation gas, compressing, condensing, expanding, and evaporating a refrigerant in a closed-loop system, transferring heat energy from the recycled gas to the refrigerant, and metering a cooled gas to the user.

Abstract: An apparatus comprising a scrubber bed; at least one heat sink operatively connected to the scrubber bed; at least one screen connected to the scrubber bed; and a scrubber tube connected to the scrubber bed. Also, a method of using a multiple mission re-breather apparatus, the method comprising attaching the multiple mission re-breather apparatus; using the multiple mission re-breather apparatus in a dry environment; and using the multiple mission re-breather apparatus in a wet environment. Further, a method of controlling a multiple mission re-breather apparatus, the method comprising activating an electronics package of the multiple mission re-breather apparatus, the electronics package comprising software instructions for adjusting operational parameters of the multiple mission re-breather apparatus in response to a change in environmental pressure; and using the multiple mission re-breather apparatus.