It looks to me like the bonding has failed. The green is also an indication of salt water in there but look at all that loose crappy wiring in there too! Sorry Marty, it looks to me like a long history of no maintenance down there. Does the rest of the bilge look like that too? If so, your winter project is clear, if this strainer failed because it's never been looked at, a bunch of other stuff down there is poised to do the same and as you saw, you could lose he entire boat. Everything below the waterline. Throughhulls, strainers, all hoses, hose clamps, stuffing box, all that crap wiring and last but not least, bonding!