Please tell me what "to think that what" is in following sentence. I haven't ever seen this phrase. What is this? And what it means? I don't require exact answer. Any help is appreciated.
"And it's kind of extraordinary to think that what, if we came here next year, we're not gonna hear this sound at all? You're gonna have to come back in 13 years. "
Sited from The Code episode 1 "Magic Number".