"Exactly. With no more disturbance than firing a big gun."

"But what good will that do?"

"I'm going up with it!"

I put down my teacup and stared at him.

"Imagine a sphere," he explained, "large enough to hold two people and
their luggage. It will be made of steel lined with thick glass; it will
contain a proper store of solidified air, concentrated food, water
distilling apparatus, and so forth. And enamelled, as it were, on the
outer steel--"

"Cavorite?"

"Yes."

"But how will you get inside?"

"There was a similar problem about a dumpling."

"Yes, I know. But how?"

"That's perfectly easy. An air-tight manhole is all that is needed. That,
of course, will have to be a little complicated; there will have to be a
valve, so that things may be thrown out, if necessary, without much loss
of air."