Last year they ran into some problems when they called the danish navy and asked 'is it ok with you guys if we tow our 115000 horsepower rocket through danish territorial waters using the largest homebuilt submarine ever built?'

unsurprisingly, the initial answer was that it was not ok. They got it solved though.

There seems to have been some negotiation this year also, due to a conflict with a NATO training exercise. In the end they ended up getting permission for a five-day window, according to this Danish article (Google Translate link): http://translate.google.com/translate?js=n&prev=_t&h...

Their submarine is homebuilt, so I doubt it will match any Russian Specs...

Theoretically it should be able to dive to 400 meters though. Pretty impressive for a few guys welding it together themsellves.

Do you have links where one can read more about the submarine?