Bunkers Afloat

We’ve all imagined what we would do if the world around us really started to deteriorate. For a (growing) number of billionaires, the plan is immediate retreat to a kitted-out underground bunker. But what if, instead, they preferred to be in the fresh air, on their own private Noah’s Ark, one safely and comfortably able to reach the most remote regions of our planet? The dream of a boat whose safe harbour is anywhere is close to becoming reality.

Rob McCallum, extreme explorer, deep-sea diver and founding partner of EYOS Expeditions, has experienced the limits of self-sufficient yachting many times over, having led more than 1,800 expeditions. When Damen Shipyards asked EYOS to help design their dream vessel, his team came back with 155 design requirements.

“They told us not one of those requirements would have been something they thought of themselves,” McCallum recalls, highlighting the current knowledge gap between conventional yacht design and true expedition preparedness. “Fuel, provisions, and garbage, that’s what gives you autonomy at sea.”

Most conventionally built yachts were designed for a week in the Mediterranean. The yachts EYOS Expeditions advises on (and later acts as charter agent for) are designed for 30 days, much farther afield, with a staff who train almost as if they’re preparing for space travel. 

The 30-day self-sufficiency cap may have more to do with human limitations. Owners, after all, are pleasure-seekers first. When asked if his clients are happy to trade away comforts for extended range, McCallum is clear: “We do five-star in the wilderness,” he explains. “We’re eating raspberry parfait with real, fresh raspberries while looking at an Antarctic glacier.”

The imperative of extended survival at sea currently stretches beyond the pleasure-seeking domain. Despite this, advances in five key areas are closing the gap.

The Need for Energy

Solar yacht pioneers boast a promise of “unlimited range.” Silent Yachts chairman, Steve Bell, is more precise. “The operating profile still matters.” In the tropics, 42 solar panels and 350 kWh of battery storage can run a non-propulsion, hotel load indefinitely. Push north into overcast, high-latitude waters and the calculus changes.

One ambitious energy solution comes from Sunreef‘s Zero Cat (below), a sailing superyacht designed to produce hydrogen fuel from methanol on board. However, shipyard co-founder Nicolas Lapp is careful to correct that its autonomy isn’t truly unlimited, as you still need methanol to produce hydrogen.

Few people have a better vantage point on where the energy conversation is heading than Jamie Edmiston, whose eponymous brokerage handled the sale of Feadship‘s Breakthrough, the world’s first hydrogen fuel cell superyacht. “That boat is influencing other yachts being designed now,” says Edmiston. His firm has since partnered with British company Levidian Nanosystems, whose technology converts methane into clean hydrogen and graphene for potential marine applications. Fossil fuels may still dominate expedition yachting, but the trajectory toward cleaner, renewable power at sea is gathering steam.

The Need for Provisions

Food production is still lagging. Deck gardens are a non-starter thanks to salt spray and relentless wind. Controlled indoor systems, however, have potential.

The most ambitious attempt was a commission that required a closed-loop hydroponic and aquaponic system capable of growing fresh produce indefinitely. Designer Simon Rowell of Bannenberg & Rowell spent four years in development, researching NASA’s bio-regenerative life support systems. Eventually, they persuaded the client away from indefinite provisioning, toward an elegant chef’s table experience, with views into growing rooms. The project, however, never went to build. “We never did get to the bottom of whether fish in tanks get seasick,” Rowell notes.

The only private yacht currently growing its own produce is the Damen 75m Hybrid (above), launched in May 2026, which carries commercial-grade cultivation pods as a proof of concept. Yet regulatory concerns continue to stand in the way when it comes to shipping live plants. “One doesn’t want to build globally relevant self-sufficiency only to find that the globe doesn’t want to play ball,” says Rowell.

Health at Sea

 

Dr Spike Briggs is both a full-time NHS intensive care consultant and founder of Medical Support Offshore (MSOS), the superyacht and marine medical support company. He identifies three revolutions in remote healthcare. First, the move from broken, single-sideband radio to Starlink-enabled, real-time telemedicine available anywhere. Second is point-of-care lab testing and clinical diagnostics. And the third is treatment frameworks that give non-medical crew a reliable structure to act on in a medical emergency.

“The limit for a helicopter evacuation is still 150 nautical miles,” Briggs concedes. Beyond that boundary, a vessel must manage whatever arises independently. “We’ve had vessels right down in the middle of the Southern Ocean, where it’s been 10, 14 days before they’ve been able to get somebody off,” Briggs recalls. “Putting all the kit on board to run a high dependency unit is the easy thing to do. The hard thing is having the right people on board to run it.”

Staying Safe

Four of the five pillars address how nature might get you in a time of crisis. The fifth addresses another threat – people. ShadowCat‘s Sentinel concept, unveiled at Fort Lauderdale 2025, carries autonomous surveillance drones, ballistic-shielded stairwells, encrypted communications, and a hardened citadel. “At this ownership level, privacy and security are inseparable,” commercial director Jennifer Johnston Smith explained at the boat show. “Sentinel allows owners to live without hesitation, knowing their world is protected in every dimension.”

The broader market is moving in the same direction. “Owners do not generally describe their yachts as bunkers,” says Bell. “They talk about privacy, comfort, independence and resilience, and some of those specifications naturally overlap.”

The dream of a “Noah’s Ark” may not yet exist, but every one of its components has been commissioned, tested and proven. What remains is the owner who asks for all of it at once, just in case.

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