Globe reader Kent Nickerson was exploring in Sirmilik National Park in the Arctic. He writes:
“The Arctic underwater soundscape is far from barren. I volunteered to listen to a hydrophone (underwater microphone) for narwhals, which make loud clicks when feeding on the bottom. A pod of these sound like a typing pool. It was the middle of mating season for ringed seals, however, and the water was full of their ghostly descending trills reverberating in the deep channel. Other sounds included murres paddling underwater and the occasional distant whale grunt.”