LAND'S END'S coastguard manager "could not distinguish sea from sky" as the biggest waves he had seen in years battered Sennen Cove.
Dave Jackson said monster waves were rolling in on Monday as a big swell, high winds and rough seas hit the county's coast.
Describing it as a fantastic sight, Mr Jackson said onlookers were awestruck at the display of nature's power.
"It was amazing," he said. "I went down to have a look; it was a privilege to see. Some of the waves were 30ft.
"I've not seen seas like that for some time; it was awesome to watch."
Born in Sennen Cove, Mr Jackson said he had seen his fair share of rough seas but in the past 15 years had witnessed nothing to match Monday's conditions.
He also works at the Minack Theatre in Porthcurno and said he had heard conditions were "pretty crazy there as well". Theatre manager Phil Jackson, Dave's cousin, said he was in the office during the day but went out to have a look a couple of times, noting the beach at Porthcurno appeared to have been transformed by the surging waves.
"The sea was reaching higher than we've seen before," he said. "There have been big waves for days – the biggest I've ever seen [were on Monday].
"It'll be interesting to see how Porthcurno will look after it calms down; the beach is looking different already."