Duration: 1m0s

What now? There's no way back up there, that's for sure. But this must lead somewhere. I'm slightly uncomfortable in the dark, sir. There's nothing to worry about, Bough. - It may be pitch black, but we can still see. - Can we, sir? How? The Bedouin monks of the Al Maghreb mountains... developed a system of sonic chanting. - I see, sir. - The sound of their chanting... would bounce back off any obstacles, and using their highly tuned ears... they could paint a mental picture of the path ahead. - Brilliant, sir. - However, you must always sing in E-flat. ** [ Humming ] * E-flat, E-flat, E-flat * * Thank you for the music The songs I'm singing * - Is it working, sir? - Extremely well, thank you, Bough. * Thanks for all the joy that-- ** - [ Thud ] - Ow! You all right, sir? I think I can see something, sir. Oh,yeah. Come on.