Prufrock never stops.
@boringcompany tour:
@Mike__Baier
"The machine's always moving forward."
"We can control the rate that we suck dirt out."
"If we don't suck enough dirt out, we would create a heave. If we suck too much out, we create a sinkhole."
Prufrock = continuous TBM. Dirt cut has to equal dirt out — or you heave / cave. Closed-loop tunneling. That's the hard part.