I am genuinely interested in learning how you think that could possibly be workable. The reason I ask is that I am not particularly knowledgeable about either explosives or the canal but I can instantly envision a number of reasons why such a course of action would be completely unworkable.

I think it's always interesting to get another perspective and I am somewhat disappointed that people have downvoted you without even wanting to hear your reasons. Such conversations are always an opportunity to either learn or to teach for those that are open to it.