Micro bat (large footed myotis bat) sounds and voice reflections from inside the disused (since 1932) Dularcha Rail Tunnel, Mooloolah, Queensland, Australia.

Audible sounds include: bat sounds, bird sounds, footsteps, distant trains (from the current train line) and voice reflections.

Sound recording by G R Legge, 32 bit float 192 kHz downsampled to 24bit/192kHz on a Zoom F3 with an Audio Technica BP4025 stereo microphone.

Photography by G R Legge. (www.onstreetphoto.com)