The movement of warm and cold water creates “huge, majestic waves” deep beneath the surface of Loch Ness.
Scientists have been studying the waves, part of a process called thermocline that begins about 20m (65ft) underwater, for years.
However, many of the thousands of visitors to the loch every year may be unaware of them.
Adrian Shine, an expert on Loch Ness, has recorded the waves moving slowly underwater using sonar.
Mr Shine led a project that included recording