The sonar images were snapped by a tour boat operator Ronald Mackenzie at a depth of more than 500ft.
They reveal an object about 33ft long, which some experts have dubbed the “most compelling” evidence of the existence of Nessie to date.
Mr Mackenzie, 49, director of Cruise Loch Ness, said: “It was a bit of a dreich day and we only had 12 passengers.
“We were at our halfway point off Invermoriston, where we turn around. The water is 189m deep there.
READ MORE: Loch Ness Monster: ‘Unidentified’ DNA extracted from Highlands
“The passengers were quite excited because we had just spotted a sea eagle ... Read even more
