The bodies of many men who died in the Western Isles' Iolaire disaster were never recovered.Read more
It is hoped the footage from the Inner Hebrides will reinforce a case for conservation in the area.
Researchers are trying to identify the group spotted off a Scottish island last year.
An injured man is rescued from a boat off the coast of Lewis.
A medieval chess piece bought for £5 in the 1960s sells for £735,000.
Scientists think the crater left by an ancient asteroid strike lies under the strait dividing mainland Scotland from the Western Isles.