KM3NeT is a European research infrastructure hosting the new generation of neutrino telescopes. It is currently under construction and consists of two detectors. This report investigates data from...Show moreKM3NeT is a European research infrastructure hosting the new generation of neutrino telescopes. It is currently under construction and consists of two detectors. This report investigates data from six already deployed units of the ORCA detector to provide a characterisation of the detector efficiencies. The isotropic efficiencies used in the Monte Carlo simulation and estimated from 40K decays are compared to anisotropic efficiency measures based on light created by muons. Shadowing effects are shown to create a bias of approximately 5% in the detected number of photons. The simulation underestimates the amount of direct light and overestimates the amount of indirect light. The latter is likely the result of an overestimation of the muon bundle multiplicity. A comparison between the reference simulation and one that assumes 5% more absorption shows a preference for more absorption for larger distances and time residuals.Show less