Easiest way to make a duck hole?

[j.e.hagen]

I wanted to see what's the best way to open up a hole in a grown up marsh. I have a good mud boat in the works. Ive been told the easiest way to do it is spray and come back a week or 10 days later cut it, repeat until your happy with it. I know this is alot of work just lookin for any tips to make this easier, I can't burn it.