A beautiful honeycomb, the nest of honeybees (likeliest candidate Apis dorsata), measuring 61cm at its widest and 41cm across - and that is by no means the full size of the nest since parts of it have been visibly broken off. It smells of honey… pure, sweet honey, although all its cells are clean. No larvae, no ants, no signs of life.
A colleague found it (or rather, it found my colleague) when it fell with a thud from the sky, presumably dropped by the raptor - likely a honey buzzard - he saw flying overhead.