Dutchsinse uploaded a video that may explaining many of the unusual sounds that have been heard around the world.
Here is the complete footage of the movie Body Found Mermaids which was aired on Animal Planet a week ago:
The Navy utilizing a new sonar weapon put ultra high frequency waves under the sea triggered the whales to wash up on beaches. All of the ocean animals found on the beaches had blood coming out of their ears, and strange abnormal growths within their body cells and damaged organs. NOAA researcher used sonar listening equipment in the sea and recorded the sounds just before the whales washed up on shoreline. The sounds are identical to the sounds everybody has been hearing around the globe.
The Dutchsinse video explains this. They think a mermaid was also on the shore with the whales, the Navy was called in and they roped the area off, removed the body.