mercury inline 6 overheated

[St.Croix_Rat]

well im upset to be on here reporting this but in life **** happens, I was out on the river for the forth and was running great until it over heated to the point it quit , I was in open water and the water pump was working i dont know how this happened but i was going slow and it just quit because the water impeller disinegrated, I replaced to impeller pu the muffs on and to find out there was water seeping through the gasket below the number 5 and number 4 plugs does anyone know if this means the block got cracked? any help or recremendations appreciated!!