From Kerbal Space Program Wiki
|| Originally the result of a unit of measure conversion bug, the S4 series of fuel tanks transcend the preposterous into the truly absurd. When 'More boosters' fails and is replaced with 'More engines!', the S4 series tanks will be there to loft your dreams, no matter how ridiculous and over-engineered, into the sky on massive trails of fire.
- This is the single, most massive part in the entire game, surpassing the Kerbodyne S3-14400 Tank, which itself was the most massive part before the Making History DLC came out.