Aerial photo from March 30, released by Greenpeace, showing the whale in Wismar Bay

Aerial photo from March 30, released by Greenpeace, showing the whale in Wismar Bay

A humpback whale that experts have been trying to coax out of shallow waters off the German coast has become trapped on a sandbank for the fourth time, rescuers said Tuesday.

After initially freeing itself from a beach close to the city of Wismar on Monday, the animal became stuck in shallow waters again on Tuesday.

Originally published on doc.afp.com, part of the BLOX Digital Content Exchange.