Watch Derek Johnson's report below
A family from East Sussex have been told that the remains of their famous relative, explorer Captain Matthew Flinders, have been discovered on the HS2 route.
His remains were discovered during an archaeological dig at a burial ground near Euston Station, 200 years after he was buried.
His burial site is among 40,000 other human remains.
Who is Captain Matthew Flinders?
Captain Matthew Flinders was a commander in the Royal Navy during the 1700s and 1800s.
He is most famous for being the first explorer to circumnavigate Australia, confirming it as a continent.
He was the commander of the HMS Investigator.
Flinders died in 1814 and was buried in the St James' burial ground.
His headstone was removed and it was thought that his remains had been lost.
WATCH: Reaction from the great great great granddaughters of Captain Matthew Flinders
Rachel and Suzi Flinders-Lewis are the great great great granddaughters of the captain.
They say they are glad that his burial is no longer a mystery.
We knew that he was buried in this burial ground. Although, of course, there is an urban myth that said he buried under platform 15 of Euston Station, though now we know that's not true."
How we build HS2 is as important to us as what we are building, which is why we are committed to sharing as much of our cultural heritage as possible. The discovery of one of Britain’s most significant explorers helps us tell stories of our past as we prepare to build a high speed rail network that is an important part of our future."