[arethuza]

For a real "doomsday" weapon you don't even need a delivery mechanism.

"When you merely wish to bury bombs, there is no limit to the size"

For a real life example - Teller's Sundial design.

[Yeul]

This reminds me of something I read about the Vulcan strategic bombers:

After dropping their bombs on Russia they were supposed to fly to North Africa and land on airstrips because England was expected to be gone.