So I bought myself some chest high waders and that meant I could waid into waste deep water. Cutting back the dogwood was painfully slow about one metre a day. There were many branches growing into the water and below te surface they ran out upto 8m into the lake. They were all tangled and it was quite strenuous to pull them out. But with a lot of effort and quite a bit of pain, gradually, over nearly 3 weeks I was able to cut them back until they were level with the bank. When completed I had added 3 extra metres to the back of the pond and cut away all the underwater tangled growth. I also had a good idea what it felt like to be in the pond, what the bottom felt like and how deep it was.