And so, I got this today - an old VHS tape (!) of Search for the Sea Serpent found on eBay. I'll watch it later this week and put a review up!
From the back:
"Prepare to be surprised on a venture to Norway in search of legendary sea serpents. For two hundred and fifty years residents living around the small Seljord Lake in Norway have reported sightings of a strange serpent-like creature. Explore the hidden depths of the lake with a group of investigators on a mission to find out what really lives in the waters below."