Earth’s elusive mantle is too much to resist for a team of Japanese scientists who plan to be the first to reach it. The team will use a giant drill to reach the molten rock, located six kilometers (3.7 miles) beneath the planet’s surface. “If we dig into the mantle we will know the whole Earth history, that’s our motivation to search,” researcher Natsue Abe, who is involved in the project, told CNN.

Japan’s Agency for Marine-Earth Science and Technology (JAMSTEC) are undertaking the massive project that will see a drill dropped four kilometers into the ocean, before drilling through six kilometers of the planet’s crust to reach its destination. “We don’t know the exact (composition) of the mantle yet. We have only seen some mantle materials — the rock is very beautiful, it’s kind of a yellowish green,” Abe said. MORE