[CW] Government scientists make the astounding discovery that CW gets through.

[Donald Chester]

Government scientists (NIST) have figured out that Morse code gets through 
when voice does not under weak signal conditions.

"...first responders may be able to receive and see simple patterns—like 
Morse code—from a survivor repeatedly turning a radio or phone on and off, 
in cases where the signal was too weak to receive audible voice messages."

http://www.nist.gov/public_affairs/releases/demolition_dcconv.htm