I happened to be flicking through the TV channels the other night and found that BBC2 was showing a documentary called "High Seas" as part of their Springwatch season. This programme spent an hour documenting the work of wildlife film-maker Gordon Buchanan as he set out from the Shetland Islands on a commercial fishing trawler on a quest to get some footage of Killer Whales (Orcinus Orca) hunting in the North Sea.