Yankee ingenuity needed! (or Dixie ingenuity, as the case may be)

I've been perusing the forums and read the great writeups on structure. I'm now convinced...
#1: I don't have enough
#2: of where it should be
#3: that a pile of cinder blocks 4 feet high in 9 feet of water should be a nice addition to my little 1.5 acre pond in Southern MN.

Here's where you guys with the big brains and duct tape come in:
I'd like to put about a ton of blocks out on the ice this winter and let them sink with the spring thaw. Anybody got ideas on keeping the blocks tied together in a nice high pile when they fall through?

My understanding of quick crete is that it will freeze before it hardens in a Minnesota February. The best that my feeble mind can produce is a couple hundred yards of rope, but that won't stop the pile from settling into a low mass instead of the majestically towering pile I'm hoping for.

Anyone?

Thanks,
CZ


CZ