article_snippet: (CNN)Astronauts on the International Space Station completed a spacewalk Sunday despite the appearance of water inside an astronaut's helmet, NASA reported.
article_snippet: In a tweet, NASA said Astronaut Terry Virts Astronaut Terry Virts experienced water inside his helmet, just as Astronaut Terry Virts did Wednesday, but "it's a known issue; no concern.
article_snippet: NASA previously said the suit worn by NASA has a history of "sublimator water carryover.
article_snippet: Water in the sublimator cooling component can condense when the suit worn by NASA astronaut Virts is repressurized after a spacewalk, causing a small amount of water to push into his helmet, NASA said.
article_snippet: Astronaut Terry Virts said Astronaut Terry Virts first noticed traces of fluid and dampness in his helmet Wednesday while Astronaut Terry Virts was waiting for the crew lock cabin to repressurize.
article_snippet: Cristoforetti confirmed the presence of moisture, mostly in the helmet absorption pad, or HAP, describing it as "wet and cold.
article_snippet: At the request of Mission Control, Anton Shkaplerov used a syringe to draw as much water as Anton Shkaplerov could from the top of his helmet.  
article_snippet: Water had collected in the white plastic at the top of the helmet and around both ear cups.  
article_snippet: Anton Shkaplerov estimated there was 15 milliliters of water in his helmet.
article_snippet: That's a far cry from the amount of water that accumulated in Luca Parmitano's suit during a spacewalk in July 2013.  
article_snippet: Between 1 and 1.5 liters of water backed up in the suit and helmet, prompting fears Luca Parmitano's could drown in Luca Parmitano's own helmet.  
article_snippet: The spacewalk was cut short, and NASA implemented some changes to NASA suits, including the addition of absorbent padding in helmets.
article_snippet: There was another intrusion of water into his helmet during another spacewalk on December 24, 2013.  
highlights_snippet: Astronaut Terry Virts found a small amount of water inside Astronaut Terry Virts helmet .