Every combat diver in JSOC, NSW, MARSOC, and Force Recon faces the same constraint: gas runs out. When it does, the mission ends — regardless of whether the objective is complete.
BIFROST eliminates that constraint entirely by harvesting breathable gas from the surrounding ocean. For the first time, a combat swimmer can remain submerged indefinitely without pre-staged gas supplies, surface support, or logistics coordination.
The operational implications if it works: extended covert beach surveys, ship-bottom operations no longer bounded by carried gas, subsurface infiltration routes that bypass surface detection, and diver-delivered payloads at ranges currently impossible.
THE PROBLEM
Combat divers operate under a single, hard ceiling: finite gas supply. The MK 25 (Dräger LAR V) — the US combat-diver standard — is held to 25 fsw by CNS oxygen toxicity, with a 10-minute ceiling at 50 fsw. The MK 16 MOD 1 mixed-gas rig reaches 150 fsw on air diluent and 300 fsw on helium-oxygen, at the cost of a backpack case, helium fills, decompression and chamber support. Both end the mission when the cylinder runs out.
Surface support craft increase the unit's signature and risk. Beach reconnaissance is truncated. Hull-attack windows are halved. Subsurface infiltration is constrained to what a diver can carry on their back — and what they can carry is the bottleneck for everything operationally downstream.
BIFROST removes the bottleneck. The diver no longer plans around the gas — the ocean is the gas.
CAPABILITIES
Covert Insertion
Zero acoustic, visual, or thermal signature. No bubble trail for sonar, no surface disturbance for FLIR. Combat swimmers become undetectable during subsurface transit.
Duration Not Bounded by Carried Gas
SOF dive missions currently limited to 4-6 hours by gas volume. BIFROST removes the gas ceiling. Mission duration limited only by the operator and scrubber — not supply.
Depth Advantage
Performance improves with depth. Enables sustained operations at depths that would rapidly deplete conventional rigs, opening new mission profiles for MCM and subsurface ISR.
Zero Logistics
No gas fills, no cylinders, no shore-side infrastructure. A SEAL platoon deploys with BIFROST and operates indefinitely from any coastline without resupply.
MISSION PROFILES
OPERATIONAL SCENARIOS
Extended Subsurface Infiltration
A SEAL platoon conducts a 14-hour subsurface approach to a hostile port facility. No SDV support, no surface craft. Operators enter the water 12 nautical miles offshore and arrive undetected, rested and mission-ready. Current systems: impossible beyond 4-6 hours.
72-Hour Covert Hydrographic Survey
A two-man dive team maps the seafloor approach to a denied harbor over 3 days, surfacing only for rest. No gas resupply, no support vessel loitering in hostile waters, no signature.
Extended Hull Operations
EOD divers conduct ship-bottom searches on anchored vessels for indefinite periods without time pressure. No emergency ascent because the clock ran out. The mission ends when the job is done.
vs. CURRENT SYSTEMS
*Design goal: limited by CO2 scrubber endurance (3–6 hrs per canister) and operator physiology, not gas supply. MK 25 and MK 16 figures are from the US Navy Diving Manual Rev 7 and NEDU reports; BIFROST figures are design targets for a concept with no hardware built.
ECOSYSTEM INTEGRATION
FAQ
How would the signature compare to an MK 25?
What about decompression?
Is this export controlled?
What happens if the harvesting subsystem fails?
When could a unit field this?
ORIGIN
Designed by AESIR founder Gage Ludwig and Clarice Zimmerman, mechanical engineer. The constraint is in the Navy Diving Manual. The solution is a design, not yet hardware. AESIR was founded to remove the gas ceiling because no current rebreather will, and the next generation of combat divers shouldn't have to plan around that limit.
THE NORSE CONNECTION
BIFROST is the rainbow bridge in Norse mythology — the path connecting Midgard, the realm of humans, to Asgard, the realm of the gods. The bridge between worlds. Our BIFROST does the same: it bridges the world above water and the world below, letting the operator move freely between them without the constraint that has always defined that boundary.
STATUS
Concept stage: architecture complete, no hardware built yet. Export-controlled development; classification pending. Targeting AFRL/AFWERX SBIR Phase II. Designed for Naval Special Warfare, MARSOC, and any SOF element conducting subsurface operations.