Has anybody been to this course before? Can you recommend it?

I cannot speak for the course itself but I know that Levent Ozdemir is a top academician in his field and Timothy Coss is a very experienced tunnel export with a lot of international contacts. Full disclosure: I never met Mr Coss face to face but once I came close to doing business with Mr Coss but it did not materialize.

To cut the long story short', I can say that both Mr Ozdemir and Coss are experts in their fields. There would definitely be some interesting knowledge and experience you will be taking away from this course.

Tim is definitely an expert tunneling  and he is also an accomplished businessman in the field. I know that he is also doing business in far east (Thailand etc).

Both Levent and Tim are doyens of the tunneling. They do not get old. They just better and mature.