Mantle drilling project aims to understand Earth's past

The video discusses a mission to collect samples to understand the origins and evolution of life. It introduces the Japanese drilling vessel Chiku, which will use extensive drilling equipment to reach the Earth's mantle. The mission targets three locations in the Pacific Ocean where the Earth's crust is thinnest. The drilling process involves creating a narrow hole 6 kilometers deep into the sea floor to access the mantle.

What does the thickness of the Earth's crust at the drilling locations indicate?

How deep will the drilling go into the sea floor to reach the mantle?