In this July 21, 2013 photo made available by NASA, European Space 

In this July 21, 2013 photo made available by NASA, European Space Agency astronaut Luca Parmitano speaks in a microphone while working in the Columbus laboratory of the International Space Station. The Italian astronaut who nearly drowned during a spacewalk in July 16, 2013 is sharing more details about the experience. Parmitano wrote in his online blog, posted Tuesday, Aug. 20, 2013 that he felt all alone as water filled his helmet outside the International Space Station. (AP Photo/NASA)
Associated Press
In this July 21, 2013 photo made available by NASA, European Space Agency astronaut Luca Parmitano speaks in a microphone while working in the Columbus laboratory of the International Space Station. The Italian astronaut who nearly drowned during a spacewalk in July 16, 2013 is sharing more details about the experience. Parmitano wrote in his online blog, posted Tuesday, Aug. 20, 2013 that he felt all alone as water filled his helmet outside the International Space Station. (AP Photo/NASA)
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