That is, in part, due to the vested interest former President Bill Clinton has in such an idea.

CENTERFORSECURITYPOLICY: Clinton's soak the rich Americans

As to the actual treatment, if anyone has the idea such chambers are little bigger than a medieval iron maiden, the centre's largest, the Krug, easily defeats preconceptions.

BBC: Hyperbaric chambers: Not just for the bends

But he has no idea how such a pact might be created, or why it would not succumb to the same strains.

ECONOMIST: A history of power