Yep, gotta admit, you got me with the headline - I was expecting major heroics, with the Nox selflessly giving its life by drowning as a precious child desperately grabbed hold of the control pod to avoid getting swept out to sea in a dangerous riptide, but allowing water ingress through the seals in the process.
Instead, it looks like wave action may have slowly loosened your coil connection, resulting in the Cd “coil disconnected” error code, which does cause the unit to shut down. Makes sense for the static you heard. Hopefully it’s as simple as just ensuring the connection is retightened, and it won’t reoccur. But definitely check the coil wire for cuts, and also maybe wiggle the reinforced connection where the wire is connected to the top of the coil the next time you have the detector on to make sure there isn’t any internal damage developing to the wire there. Sounds like the worst case might be the need to replace the coil.
Regardless, wonderful save on that little statue! Hopefully she polishes up nicely - I can’t wait to see the results! Don’t listen to metaladdict…I’m too sentimental about this kind of unique find and the mystery behind how it was lost to see it melted down