And now a very special field recording captured by a group of German scientists from the Alfred Wegener Institute for Polar and Marine Research while recording seismic signals in the Antarctic. It’s the sound of a massive 50 by 20km iceberg slowly grinding its way over a submerged outcrop in the seabed. Normally, this is a sound that would go unheard by human ears, as the frequencies occupy a register far lower than what is audible to us (around 0.5 hertz apparently). But the scientists have sped it up so we are able to hear this geological event unfold for the first time. (via WFMU)