[david-gpu]

> they showed us the correct method. It was simply to send the tank up in the elevator unattended—one undergrad pushing the "up" button and stepping out, the other waiting for it on the destination floor. Stupidly simple.

That works great until somebody in an intermediate floor enters the elevator oblivious to the risk and suffocates.

[gambiting]

That's what service keys are for - with the key turned, the lift will go directly to the selected floor without stopping.

[dragonwriter]

It’s possible this was between adjacent floors, in which case this risk would not exist.