A team of elite cavers led by 68-year old Bill Stone attempts a months-long expedition to officially make Cheve Cave in Oaxaca, Mexico the world’s deepest cave. A massive logistical undertaking abov...
For two years BBC cameras have followed, Dr Sheperd Doeleman of the Smithsonian Astrophysical Observatory and the work of the Event Horizon Telescope project team, a collective of the top scientific...