Re:Biggest explosion ever documented in the universe [pdf]
by arethuza on Wednesday March 11, 2020 @08:19AM
(#22545141)
Edward Teller did apparently try and push for a 10 gigaton (!) bomb to be produced:
https://www.rbth.com/opinion/2016/01/05/nuclear-overkill-the...
Edit: Apparently this monster was the infamous "Backyard" bomb - "since that particular design would probably kill everyone on Earth, there was no use carting it anywhere."
Not that you'd ever get that many because 10^61 is about 10^7 solar masses worth of energy.