Lukas Furtenbach, the celebrated Bergführer, orchestrated a vertiginous ascent of Everest by a British contingent, leveraging the purportedly prophylactic effects of xenon gas inhalation, a technique now embroiled in controversy and subject to scrutiny by Nepalese mountaineering syndicates; the expedition, commencing in London on May 16th, culminated in a summit on May 21st and a return two days hence, following intensive pre-acclimatisation regimens involving hypobaric simulation and xenon therapy at a German institute, the ethical and physiological ramifications of which remain vigorously debated, despite Furtenbach's assertions regarding the minimisation of both acclimatisation-related detritus and overall ecological footprint, coupled with his avowal of demonstrably verifiable safety protocols, notwithstanding the extra-territorial application of the aforementioned xenon regimen.