A woman got home to find men digging a trench that was used to bury the bodies of a murdered London family, a court has heard.
The defendants are accused of dumping the bodies at sea
Belinda Brewin told the Old Bailey she went "absolutely ballistic" after seeing the men digging the hole at her home near Tiverton, Devon.
Three men deny murdering five members of the Chohan family in February 2003.
The jury in the continuing case heard the men carried out the killings in a bid to take over Mr Chohan's business.
Miss Brewin was giving evidence for the second day of the trial of Kenneth Regan, 55, of Forge Close, Wilton, Wiltshire, William Horncy, 52, of Adeline Road, Bournemouth, and Peter Rees, 39, of Kings Close, Rowlands.
Hounslow resident Amarjit Chohan, 45, his wife Nancy, 24, their two sons, Devinder, 18 months, and Ravinder, two months, and Mrs Chohan's mother, Charanjit Kaur, 51, disappeared in February 2003.
They were murdered, and their bodies allegedly secretly buried in Miss Brewin's 50-acre estate at Great Colefield House, Stoodleigh.
The court has heard the bodies were then dug up in April, after she became suspicious and contacted police.
The bodies were then dumped in the English Channel, where they were later found.
Miss Brewin said she returned from London earlier than expected on 20 February last year, after being offered a £72,000 job by Mr Reagan, and found the men digging the trench.
She said: "I went absolutely ballistic. I was furious. I said 'What the hell is going on here?"'
She said: "I saw Mr Horncy by a gate and another man near a digger. There was a bloody great big trench dug in my field.
"I spoke to Mr Horncy. He said that Regan had asked them to come down to sort out my drainage ditch down there and he said it was supposed to have been a surprise.
"I said: 'You can tell Regan from me that that he has surprised me'."
Miss Brewin said she had noticed charred remains near one end of the 12ft hole, and also noticed a "ferocious fire" had taken place nearby.
"I was furious. I could not tell what had been burnt," she said.
She said she had asked Mr Horncy what had been set fire to, and he told her it was a foam sofa that had been brought down from Salisbury.