Watch: HIV+ Olympian Greg Louganis Didn't Think He'd Live to 30

It's about that time again. Another Summer Olympics is almost here and athletes from all over the world are in their final days of training. It's also about time for another Oprah: Where Are They Now?.

Oprah catches up with some old friends from Olympics past. Mark Spitz, Bart Conner, Nadia Comaneci, and Greg Louganis are all guests on this special episode.

In an exclusive clip, Louganis talks about his HIV diagnosis that once felt like a death sentence. Having been diagnosed six months before the 1988 Olympic games, he didn't think he'd live to see 30. Now at 56, his viral load is down and his T-cell count is the highest it's ever been.

The special episode of Oprah: Where Are They Now? airs Sunday, July 24 at 10PM ET/PT on OWN. Watch the clip below: