HELP:Slant Six Wont Turn Over

Could you possibly have gotten water in one of the cylinders? Take the spark plugs out and turn the engine over (with starter or by hand) and see if any water comes out. If any water got into a cylinder, it will dead stop the engine on the compression stroke for that cylinder. If it will crank with the spark plugs out, enough water will blow out for you to put the plugs in and try starting it again.