Marathon Ontario - Steam locomotive number 694 derailed near Schreiber more than 100-years-ago and slid down a 20-metre embankment into the water.
Three crew members died in the accident.
Recently divers located the locomotive's pony wheels but the engine lies deeper in 275 feet of water near a box car found at that depth.
Visibility was extremely poor.
It is expected the locomotive proper will be found during a dive to be performed August, 2015.