Unfortunately I think you're either going to have to fill the pipe with concrete, drop the water and dig in another one, or drop the water and replace that one.

If left in place, I'd be constantly worried about the same thing happening, only worse.....

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).