"No, I can't say I do. I wasn't there."
"Do you really think it was an accident?"
"Can't prove it wasn't."
"But at least you've got some ideas," Tom said.
"Takes more than ideas to make a case," he said at length. "But there's
one thing I do know. I've got no proof, not a shred of it, but I'm sure
of one thing just as sure as I'm on Mars." He looked at the twins
thoughtfully. "Your dad wasn't just prospecting, out in the Belt. He'd
run onto something out there, something big."