The Loch Ness Monster was spotted by a film crew making a documentary about the beast - but it disappeared before they could focus their camera.
Warren Speed and Jamie Huntley said they saw Nessie with their own eyes and described it as being around five metres in length with having a whale-like hump.
Jamie, 35, tried to whip out his camera to get a photo of the beast but it ducked under the surface before he got the chance to get a picture.
Warren and Jamie's sighting is the second time Nessie has been spotted this year, as an 'expert' recorded an official sighting after spotting 'two objects moving parallel to each other'.
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Producer and filmmaker Warren, of Newbiggin-by-the-Sea, Northumberland, said: "Unbelievable as this sounds, me and Jamie saw something very large in the loch.
"I saw something like a very large upturned boat out of the corner of my eye about 200m away from the shoreline, then Jamie shouted stop.
"He saw it fully and said it looked like a very dark whale - a hump.
"By the time I stopped the car, a few metres later, trees were covering our view, I quickly reversed, Jamie jumped out.
"But all he got on his phone camera were very large circular ripples, but in the exact spot the 'creature' had been.
"And as we watched it looked like ‘it’ was moving away from us underwater before totally disappearing a few moments later.
"If we had arrived literally 10 seconds earlier, we would have caught this properly on camera.
"We were absolutely gutted that we missed what would have been a genuinely historic picture.
“But also amazed at what we had both seen as we were both very sceptical about previous sightings.
"As we are actually here in Loch Ness filming a documentary on all of the strange occurrences in the area, we expect ridicule and disbelief but we both know exactly what we saw.
"Nessie hunter Steve Feltham, who we met later in the day, agreed our experience sounded and looked like a genuine sighting similar to others over the years.
"And Jamie has logged it with the Register of Nessie sightings."
Jamie, of Gateshead, added: "I looked towards then cemetery and then the large object or creature in the loch caught my eye.
"At first I thought it was a big boulder or something, I said to my friend driving ‘What's that it's huge?’
"The object/creature was reflecting the water so looked wet, almost like a whale skin crossed with a fish skin, it was dark in colour - darker than the water surrounding it.
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"There were dark greys, black, browns in colour, it almost looked like how a whale hump might look breaking the surface minus the fin.
"There was a definite movement but didn't see too much of the movement before trees obscured it, it was a very big size at least 15 foot long, maybe bigger, around the middle of the loch."
The earliest sighting of the monster was recorded by Saint Columba in 565.
But Nessiemania really took hold in 1933 when George Spicer and his wife claimed a 25ft-long beast crossed the road in front of his car.
A year later, the famous "surgeon's photograph" appeared to show Nessie's head and neck poking out of the water. It is now believed to be a hoax.
Nessie hunters have flocked to the waterside ever since.
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