How does the blue whale at the American Museum of Natural History stay suspended?

How does the blue whale at the American Museum of Natural History stay suspended?

The Smithsonian has a great photostream that presents “a sampling of images documenting women scientists and engineers from around the world, most of whom were pioneers in their respective fields, or were the first women to receive advanced graduate degrees in their discipline.”
via: Miss Moss

Following along at the Moby Dick Marathon, New Bedford MA
The Moby Dick Marathon at the Whaling Museum, New Bedford MA