The idea comes from Portuguese artist Joao Onofre as part of an exhibition called Sculpture In The City. His intention, to quote from the exhibition documents, is that “the box is soundproofed, determining and restricting the performance’s duration to the length of time in which the oxygen is expended”.

Disappointingly, for those who might want to watch this death rattle-and-roll, passers-by won’t be able to see or hear the musicians when the box is closed - the walls are thick and solid. Instead they’ll have to settle for seeing the band walk in and, presumably, crawl out, while getting some of the vibrations from the noise inside.

Displaying as much humour as their surely comic name, Unfathomable Ruination defiantly posted on Facebook, in response to medical professionals warning they might die: “Challenge Accepted”. Adding that they would welcome bets on “who will be the first member to perish without oxygen” as they perform this feat of derring-do three times a week until August 1.

If you had considered this installation might be a Portuguese payback for the sad elimination of their football team from the World Cup with little more than a whimper, the evidence suggests otherwise. Onofre has run this art project before – each time with a death metal band - in Paris, Barcelona, and Switzerland, and two of those are countries which outlasted Portugal at the World Cup.

It’s worth noting that one of the bands which played, and survived, the box in its earlier incarnations, Holocausto Canibal (no, really, that’s what they’re called) both encouraged and advised Unfathomable Ruination.