Sunday Six: We're Going to Make It

Today's Sunday Six comes from Chapter Seventeen of Rock Killer:

We're going to make it, Chun thought.  The air was stuffy and Alex noticed he found exertion becoming difficult.  The partial pressure must be dropping, he thought.  But they were going to make it.  "How long until the Kyushu can match orbit?"
Naguchi said, "Fifteen minutes."