World Trade Center ship has been a mysterious figure since it has been unearthed in 2010 after the 9/11 attack. The "mystery" wreck has been named the World Trade Center ship as it has been discovered under the ruins of the Twin Towers. Scientists finally solved the mystery of the old ship and found it to be at least 240 years old, having its wood from the 1770s also used in the construction of the Independence Hall.

According to reports, the World Trade Center ship was discovered back in 2010 by construction workers as they were clearing out the area where the WTC once stood. That was four years ago this month.

Archeologists monitoring the excavation site uncovered part of the World Trade Center ship. Located below today's street level, the ship measured 22 feet, that's about 6.7 meters. According to the Daily Mail, the pit where the World Trade Center ship was discovered is now an underground security and parking complex.

At the beginning, Observation Deck reports that researchers were baffled by the vessel located under the area where the WTC once stood. However, in a new study, the mystery of the World Trade Center ship was finally revealed. Scientists found out the ship's age and how it ended up under the WTC.

After archaeologists excavated the ship, they sent pieces of the wood from the World Trade Center ship to be tested. They discovered that the ship was built from trees cut down in the year 1773 in Philadelphia.

Columbia University's Lamont-Doherty Earth Observatory tree-ring scientists were reportedly amongst those asked to analyze the remains of the World Trade Center ship for clues about its age and origins.

The group used tree ring patterns from the wood of the World Trade Center ship and compared them to live samples.

According to 7 Online, the scientists said, 'Therefore, the ship's construction date of 1773 is important in confirming that the hull encountered at the World Trade Center represents a rare and valuable piece of American shipbuilding history.'

The study on the World Trade Center ship has been included in the scientific journal "Tree Ring Research." Scientists said an old growth forest in the Philadelphia area supplied the white oak used for the frame of the World Trade Center ship.

Worth mentioning amongst the revelations was that the wood from the World Trade Center ship matched samples taken from Independence Hall, where the Declaration of Independence and the Constitution of the United States was signed.

Dr. Dario Martin-Benito, leader of the study stated, 'What makes the tree-ring patterns in a certain region look very similar, in general, is climate.'

The World Trade Center ship had been uncertainly identified as a Hudson River Sloop, which was reportedly designed by the Dutch for passengers and cargo to get through shallow, rocky water. According to reports, the World Trade Center ship was probably built in Philadelphia, which at the time was a center for ship-building.

According to historians, the World Trade Center ship was already obsolete by 1810, the time they used it to extend the shores of lower Manhattan.

Molly McDonald, an archaeologist who first spotted two pieces of timber from the ship's frame on Tuesday said, 'A ship is the summit of what you might find under the World Trade Center - it's exciting!'

After 20 to 30 years of service, the World Trade Center ship was thought to have sailed to lower Manhattan, at a block west of Greenwich Street. 7 Online reports that the ship was probably buried as junk over 200 years ago, as filler to a landfill in the process of extending Manhattan into the Hudson River in the 1700s and 1800s.

According to the Daily Mail, the World Trade Center ship would have vanished from completely. However, due to the terrorist attacks on Sept. 11, 2001, the WTC was excavated and the ship was found again.

World Trade Center ship may have been filler to a landfill 200 years ago, but to many people today, it's treasure popping up from the mud, full of history. To see photos of the wreck, click here.