I checked my TVguide but unfortunetly it had no reference, not even the english title. But what I watched was the first part so I'll wait for the second part and see what I can find.
The documentary described the attempts of a young paleontologist I think in colorado museum (could be california, it definetly started with a C) to prove his unapproved theory. Then they find a well-preserved body of a 'dragon' in Romania and he makes some tests. So in the end it claims that it retained hydrogen in glands which gave it a lifting force, and it could use the hydrogen together with methane as fuel to pour fire.
