Pluto looks quite sensible compared to Gnomon and Sundial - 1Gt and 10Gt bombs respectively (yes Gt not Mt): http://blog.nuclearsecrecy.com/2012/09/12/in-searc

Pluto looks quite sensible compared to Gnomon and Sundial - 1Gt and 10Gt bombs respectively (yes Gt not Mt): http://blog.nuclearsecrecy.com/2012/09/12/in-search-of-a-bigger-boom/ http://blog.nuclearsecrecy.com/2012/09/12/in-search-of-a-big... Edit: Fortunately the development of these devices didn't get too far advanced.