I have never heard of a fire system override not working but who knows. Could also have been an issue in the interface between the fire system and the MTUs. When I took over the 116, the Seafire system had not been inspected in a while and when we tested the shutdowns, it only killed the gens and the blowers bit the MTUs. I had to get an MTU electronic specialist to trace the wiring and get it to work… took him a while. Now both shutdown and override are tested every year during the fire system inspection.
You d be surprised how many boats I ve seen with fire systems not inspected in years
Releasing the anchor manually isn’t always easy especially on a macho sport fish with no railing. On a boat that size there is likely a brake on the windlass that need to be released in addition to the lock. Then you need to find the wrench or bar to release the clutch. And pray that the weight of the anchor is enough to let it free fall. Not a given… don’t ask how I know.
Not that it would have made a difference but I doubt Viking built that boat with a single hydraulic pump…