In 2016, Michelle Ridgeway explored the canyon in an eight-foot submarine in an expedition sponsored by Greenpeace, reaching a shelf at a depth of, that is a third of a mile below the surface.
Michelle Ridgeway explored the canyon in an eight-foot submarine in an expedition. This was in 2016. This expedition was sponsored by Greenpeace. Michelle Ridgeway was reaching a shelf at a depth of, that is a third of a mile below the surface. This was in 2016.