Chevaline submarine-launched missile post-boost system.

Fullsize image: https://diqn32j8nouaz.cloudfront.net...e_fullsize.jpg




More: https://en.wikipedia.org/wiki/Chevaline

Previously:

Bomarc surface-to-air missile intercept - GIF
Blackhawk missile slow-motion shockwave - GIF
U.S. Navy submarine missile launch tubes - photo
Minuteman II missile silo blast door - photo
Underground missile door mechanism - video