  Long-lived particles are predicted by many extensions of the Standard Model
and have been gaining interest in recent years. In this Letter we present a
competitive proposal that substantially extends the sensitivity in lifetime by
instrumenting the existing service shafts above the ATLAS or CMS experiments
with tracking stations. For scenarios with electrically neutral long-lived
particles with $m \gtrsim 1$~GeV, the lifetime reach is increased by 2-3 orders
of magnitude compared to currently operating and approved future experiments at
the LHC. A detector design proposal is outlined along with projected costs.
