Just looking around some figures.... Hyperbaric Oxygen Therapy for 'sepsis' seems adequately proven as a (additional / concurrent) treatment for Sepsis, the main means of COVID killing the victim. Pressure required ranges from 1.5 x atmospheric up to 3x. Or 45psi.
The usual method is a decompression (diving) chamber, complex and not cheap.
Suggestion is, re-purpose some obsolete airliners (fuselage) of suitable size, like the grounded Boeing 737 MAXs...With around 80+ useable square metres of floor space several patients could be comfortably treated at the same time.
From memory, PAX aircraft are pressurised to equivalent of 8,000 feet, or c. 12 PSI INside pressure. Their max altitude is 40K feet, or 3 PSI on the outside giving a 4:1 differential. All do-able from an Engineering angle. Financially, well makes as much sense as spending zillion$ on R&D on COVID - vaccines, which if we take into account past history of successful (?) "corona" vaccines such as the yearly 'flu shot... well, say no more !!!
So, a bit of lateral thinking outside the box to treat 20 to 50 patients at a time, or wait 6 months to START preventing a % of vaccinated victims from catching COVID. - at much more co$t ?
(and employ some laid-off Airline Engineering staff to maintain & run them. - Save on paying them JobSeeker !)
EDIT: Yep, got too much spare time between school bus runs....![]()



With around 80+ useable square metres of floor space several patients could be comfortably treated at the same time. 
as well as wearing a large Mexican Sombrero, a brightly coloured shawl & have Castanets & Trumpets in the background & blokes singing in an unintelligible Language.



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