  The Future Circular Collider (FCC) study was launched as a world-wide
international collaboration hosted by CERN. Its goal is to push the field to
the next energy frontier beyond LHC, increasing by an order of magnitude the
mass of particles that could be directly produced, and decreasing by an order
of magnitude the subatomic distances to be studied. The FCC study covers two
accelerators, namely, an energy-frontier hadron collider (FCC-hh) and a highest
luminosity, high-energy lepton collider (FCC-ee). Both rings are hosted in the
same 100 km tunnel infrastructure, replicating the CERN strategy for LEP and
LHC, i.e. developing a lepton and a hadron ring sharing the same tunnel. This
paper is devoted to the FCC-hh and summarizes the key features of the FCC-hh
accelerator design, performance reach, and underlying technologies. The
material presented in this paper builds on the conceptual design report
published in 2019, and extends it, including also the progress made and the
results achieved since then.
