Marine biologist Matthias Kopfmüller wants to know whether the Wallace Line exists underwater. We descend deep into a subterranean crevice and shine a light on a universe that has never before been captured on film.
Marine biologist Matthias Kopfmüller wants to know whether the Wallace Line exists underwater. We descend deep into a subterranean crevice and shine a light on a universe that has never before been captured on film.
