Rare and in some cases never before publicly seen video of the 1986 dive to the wreckage of the Titanic is being released today by the Woods Hole Oceanographic Institution.

There are more than 80-minutes of footage on the institute’s YouTube channel that chronicle some of the remarkable achievements led by diver Robert Ballard.

The expedition marked the first time that human eyes had seen the giant ocean liner since it struck an iceberg and sank in the North Atlantic off Newfoundland on its maiden voyage from Southampton to New York in April 1912.

Some 1,500 people perished.