Live Stream from below Antarctic Ice

The german Alfred-Wegener-Institute is transmitting a MP3 live stream from Antarctica. They put four hydrophones 70 m underneath the shelf ice and 90 m above the ocean ground through drilled holes in the thick ice sheet. In close proximity to the open water the microphones catch the calls of sea mammals living in this remote region. The scientists in their homebase Bremerhaven are able to analyze the behaviour of whales and seals just as it happens. Only occasionally the electronic-sounding concierto of the seals is interrupted by calving glaciers and colliding icebergs. This recording though baffled the scientists because it doesn’t belong to any sea creature known and nobody heard ice breaking like this before. It’s your guess. The Alfred Wegener Institute gratefully let me use this recording in my piece frost pattern.