https://www.cnet.com/news/nasa-massive-meteor-exploded-over-earth-but-almost-no-one-noticed/

A fireball this big is only expected about two or three times every 100 years, Lindley Johnson, planetary defense officer at NASA, told BBC News on Monday. However, because of its remote location, almost no one noticed. Military satellites picked it up and reported it to NASA.  

NASA's data shows the two largest fireball explosions in recent years -- one above Russia in 2013, the other above the Bering Sea in 2018.