« Hi ! everyone, can you guess who I am ? --  I was designed by Sir Alexander Binnie, and constructed by John Cochrane & C°. I once replaced a ferry and would daily enable workers to reach the London docks and shipyards. My lifts were installed in 1904. I am found  50 ft deep and my length is 1,215 ft. I link Greenwich and the Isle of Dogs. You can still admire my glazed domes : I am … I am … ? »

 Well, the answer is Greenwich Foot Tunnel. Incredible : you will even hear the Tunnel if you  log in to this website : < sonicwonders.org/greenwich-foot-tunnel >