Alcor upgrades its dewars and skips the specs
Alcor unveiled a new super-dewar on LinkedIn without a single published specification, even though its separate nitrogen-reserve expansion came with concrete numbers; the last dewar performance data is from 2008.
On June 16, cryonics organization Alcor posted a photo of its new super-dewar on LinkedIn. The caption: largest and most advanced vessel in the fleet, cheaper to manufacture, better at holding vacuum. Technical specifications: none. No capacity, no boil-off rate, no vacuum pressure, no patient berth count.
A dewar in cryonics is a vacuum-insulated vessel in which a cryopreserved patient is stored in liquid nitrogen at around -196 °C for years or decades. The engineering parameters that matter are concrete: how well the vessel holds vacuum, how quickly the nitrogen boils off, how refilling works, how to move a 2.5-ton container, and how to catch a problem before it becomes a failure.
The last published numbers on any of this are from 2008. Alcor's documentation from that year showed its Bigfoot-series dewars lost between half an inch and three-quarters of an inch of liquid nitrogen per day. Engineer Hugh Hixon estimated that if nitrogen deliveries stopped entirely, patients would remain below -180 °C for over 90 days. In another technical note, Alcor described a more mundane engineering problem: a dewar weighs about 5,500 pounds, roughly 2.5 tons. Moving one used to take four people; after the purchase of a Cart Caddy, two operators can do it. This is what cryonics looks like in practice: pumps, carts, sensors, heavy vessels, and a nitrogen top-up schedule.
A separate announcement makes the missing specs hard to excuse. Earlier this year Alcor said it would expand its liquid nitrogen reserve from 900 to 13,000 gallons, with concrete figures published in the May newsletter. Alcor can publish specifications when it chooses to.
The two assets solve different problems. A large nitrogen reserve answers the question of how much fuel the facility has. The dewar's specifications answer the question of how reliably the storage vessel itself holds the cold. Real infrastructure needs both: a good vessel with no nitrogen reserve is still a problem, and a large reserve does nothing for a dewar with poor vacuum.
Cryonics as a service is sold on the trust that storage will hold for decades. Customers pay upfront; possible revival is a hypothesis about the future. The immediate engineering question is simpler: whether the physical bridge stays standing. Without published specifications, there is no way to evaluate whether the new dewar answers that question any better than the old ones. There is literally no data to work with.
The Alcor page on Eternal Search collects what is actually documented about the company. The infrastructure investment is real, but infrastructure without published specifications is marketing until the numbers arrive.
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Sources
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The super-dewar story is a direct infrastructure-and-transparency item that maps cleanly to the Alcor company page on Eternal Search, where readers can check what is actually documented about the organization against what it announces on LinkedIn. The approved concept uses the 2008 Bigfoot benchmarks and the nitrogen-reserve announcement with numbers to make the gap between hardware investment and published specs concretely visible and checkable.