Need Help And Ideas On Salvaging Thru The Ice

[king of obsolete]

i need ideas on how to find a sunken cat that is in 120 feet of water and about 4 feet of ice. this cat was lost while winter freight in 1958 and we figure a camera would work for hooking up the cable for recovery. but need something else that would help locate the cat by doing a grid pattern on the ice.
also some new army vehicles went down too. during the war, fish was an important supply of food and new army trucks were used to haul the fish. i went to borrow a picture of the army trucks which i think are cmps, but the fellow passed away and the kids have the pictures now. in the cold canadian water these sunken euipment should come up shine and new.
so any ideas and click on to see my website where i have more info on the sunken cat.

http://kingofobsolete.ca/sterling_SU...AT_WEBPAGE.htm

thansk