A group of amateur metal detectives just got the surprise of their lives when they came across an actual treasure chest full of silver and gold coins.

The four men, who have been partaking in metal detecting as a hobby for less than a year, were scanning a field in Buckinghamshire, England when they initially came upon twelve beautifully decorated silver coins. As they continued to find more and more coins, the men were stunned to find that they belonged to a hidden 14th century treasure hoard.

Over the next four days, the men excavated 557 coins, including 12 ultra-rare full gold nobles from the time of the Black Death. The coins are currently being stored in a museum, but they will soon be independently evaluated and sold.

Experts estimate that the treasure, which is known as the Hambleden Hoard, could be worth £150,000 ($193,000) and was stashed there around 600 years ago by a wealthy person for safekeeping.

Mateusz Nowak, one of the four men who works as a hospital cleaner, said that the find “felt unreal.”

“After finding the hoard, and then clearing the area, we had to extend the search twice more because we were finding so much,” Mateusz said. “It was a miracle moment after moment for everyone.”

Tobiasz, Mateusz’s younger brother who is employed as a baker, added, “I can’t even imagine how we got so lucky. It was the best weekend of my life. I’ll remember it my whole life.”

The brothers had been scanning the field for an hour with their friend Andrew Winter and were just about to go to another location when their detectors suddenly started beeping.

“I swung around my machine and all the silver coins were coming in at number 16 on the screen. This indicates a hammered silver coin,” recalled Andrew, who works as a forklift driver. “The other signal I got was a 21. It went ting, ting, ting and sounds completely different to anything else. I shouted ‘gold, gold gold!’”

“The lads just looked at me and I knew then we had something special,” Andrew continued. “We knew there and then this was going to be one of the ones you never, ever forget. And to do it with my two best friends was really special. We just kept finding, finding, finding and digging and digging and digging. My machine was like a hoover.”

Andrew went on to describe the find as “very, very rare.

“The coins look like they’ve come straight off the shelf,” he said. “They look brand spanking new. Some of the silver ones are really rare and have things on them – like little birds or churches – I have never seen before.”

“It feels unreal. I can’t believe it,” he concluded. “It couldn’t have happened to three more common guys you know.”