Watch Ore's report
A British teenager has become the youngest person ever to sail around their world on their own.
Mike Perham, 17, set sail in his yacht last November and he crossed the finishing line just off Lands End at around 10am on Thursday morning.
Mike's voyage took him to loads of places including Portugal, South Africa, Australia and New Zealand.
In order to set the new world record, he had to cross the equator and every single line of longitude.
The previous world record was held by American Zac Sunderland, who was two months older than Mike when he completed his journey in July this year.
But Mike might not hold the record for long - 13-year-old Laura Dekker from the Netherlands is hoping to set sail on the same voyage.
Laura's parents are happy for her to try it, but lots of people reckon she's far too young for such a dangerous adventure and officials are trying to get a court to stop her.
Mike talks about his adventure
A decision on whether Laura can set sail on her challenge is due to be made on Friday.
The world record is Mike's second - in 2007, when he was just 14, he became the youngest solo sailor to cross the Atlantic
His dad followed behind him in a boat on that journey - but this time he was all on his own.