I wasn't there to see it but...
Rule number 1: no bilge pump is always a bad idea... 2 bilge pumps is a better idea....with one rigged with a float switch on automatic all the time.
If those engines were submerged, get it out of the water, pull spark plugs immediately, check crankcase to see if full of water, if not, crank engines over to ensure the cylinders are clear and get those engines fired And let them run a long while...while spraying them down with a freshwater hose to get rid of salt water/residue ASAP!!!! Change oil and proceed to disconnect every piece of electrical, inspect and dry and clean up...get ready to fight electrical gremlins in the coming weeks and months.