Ruin Explorer
Legend
Orion is positively sane compared to the proposed usage for an actual nuclear ramjet, Project Pluto.If you really want to have your brain melted, look up the Orion Propulsion System.
On a charming note, Putin recently claimed to have basically resurrected Project Pluto (though the complete lack of radioactivity from the test in October strongly suggests the whole "nuclear ramjet" bit is a fiction, at least for now).