Ice Is Unpredictable (video)
Never consider ice safe. The up and down temperatures have made ice conditions unpredictable all over New England. There have been several instances of people going through the ice this winter, including riders on snowmobiles. MassWildlife has posted ice strength and safety information.
Dr. Gordon Giesbrecht, of the University of Manitoba, also known as Dr. Popsicle, has three amazing videos where he demonstrates survival techniques if you should ever crash through thin ice. This video depicts a sled traveling a lake at night.