The KM3 Neutrino Telescope 2.0 (KM3NeT 2.0) is a multi-site Research Infrastructure housing a next generation neutrino telescope. Located in the deepest seas of the Mediterranean, KM3NeT 2.0 will explore the neutrino Universe and also study the properties of the elusive neutrino particle. Arrays of thousands of optical sensors detect the faint light emitted in the deep sea by the passage of charged particles originating from collisions of the neutrinos and the Earth. The facility will also house instrumentation for Earth and Sea sciences for long-term and on-line monitoring of the deep sea environment and the seafloor at depth of several kilometers. With the giant ARCA telescope, KM3NeT 2.0 scientists will search for cosmic neutrinos from distant astrophysical sources such as supernovae, gamma-ray bursters or colliding stars. With the compact ORCA detector the oscillation behaviour and mass ordering of the neutrinos will be studied exploiting neutrinos generated in the Earth’s atmosphere. In the ESFRI Roadmap since 2016, KM3NeT 2.0 is in the Implementation Phase but already is providing interesting results as construction proceeds.