I am the master of awkward silences and I was fine during my interview there. They move from question to question pretty easily and ask good follow up questions so there really isn't much time for silences. All of the questions are about you and things you've done or experienced in the past so unless you get stumped on one of the questions (which you might, but they let you skip and come back if you want), then you'll be fine. Most people can talk forever about themselves. It honestly just felt like storytime.
Disclaimer: I interviewed 5 years ago so things may have changed since then.