Any electronics or engines can be saved when sunk in salt water providing the electronics wasnt powered at the time of sinking.Just wash them out with fresh water and soak the electronics in denatured alcohol and let dry,diesel Engines pull the injectors,vac out the cylinders,squirt some oil back in,crank em over by hand and fill back up with oil,crank some more dump the oil and fill with oil and run it.Same goes with gas engines.2 strokes its alot easyer,just pull the plugs and crank the engine till all the water blows out then run it.Alot of people think when a boat sinks that its ruined forever.When i got my striker it was partly sunk by hurricane wilma,the engine room was completely filled up with rain water,no water was in the cylinders just alittle in the turbos,all the oil floated out and 40 gallons was in each crankcase.I pumped out all the water dryed out the starters and alts and injection pumps and they both ran after 3 days of working on them.No water got in the trannies.My uncle gave me the boat and thought that both engines were trashed,he was amazed that i got them running again.All the electrical was a different story,the AGM batteries were brand new and connected,the electrolysis fizzed off dam near all the electrical connections wherever there was power.1 battery was still good but both were still on warranty so i got 2 new ones.The boat had 400 gallons on diesel in the tanks,im sure thats what kept it afloat.I pumped out 20 gallons of salt water out of the stern tank.The furuno dept finder was totally submerged but not powered im still useing it.Now i have a industrial vacuum system that i use to dry my used cooking oil.Im building a chamber big enough to put wet electronics in to dewater them.I can save a few cell phones for a small fee of course.