The Skanska construction crew in Boston was too busy working with their daily task and as they were digging on a lot of land planned for a 400,000-square-foot office building, they found a 50-foot wooden ship from the mid to late 1800s.

"This is the first shipwreck that I know of in Boston discovered in filled land," city archaeologist Joe Bagley told CNN.

"This is the largest and most significant by far," Bagley added.

The area lot where the old shipwreck was found was once called the Dorchester Flats. According to Bagley, this is the first time a shipwreck has been found in this section of the city. As of the moment, He  is not yet sure what caused the shipwreck.

The crew unloaded most of the valuables, and they tried to set part of the ship on fire in order to reduce its weight because the ship sank in the mud.

Skanska, the construction company, met with city officials to report what they discovered. Currently, several archaeologists are inspecting the site.

"You certainly come across a lot of interesting things when you do below-grade excavation, but I've never seen anything like this in my career," Skanska president and CEO Shawn Hurley said in a report by CBS Local.

"I can say in my entire career I've never come across an artifact," Hurley added.

After discovering an old shipwreck, the CEO of the company said they immediately halted excavation in the area and contacted authorities who are more knowledgeable about the boat and how best to move around the site.

On May 26, Thursday, archeologists hope to bring in 3D imaging equipment to create a 3D map of the boat.