Trogs,
I also heard that it was the concrete storm drain cover which gave way. I don't know how much damage it did, but the S76 is not renowned for a strong undercarriage and it is particularly weak in the fore/aft plane. We had a 76A++ undercarriage damaged in Ghana recently when the poorly repaired tarmac on the apron gave way when it was being towed. It's quite common to find that drain covers here are of substandard construction, often with no reinforcement. It's for that reason we have steel plates over the top of the drain covers at the entrance to our hangars. I would imagine that Aero will do the same now, if they don't have them already, as I think they also overnight the new EC225 that new hangar. I believe the aircraft has now been lifted out with a portable crane. Hopefully the damage will not be too severe as it was moving slowly at the time of the incident.