That rings a bell.

Mortals, Kiss recalled, when cast away on desert islands, sometimes write messages and put them in bottles, in the hope that somehow, at some time, somebody will find them and do something: notify the next of kin, or the coastguard, or more likely the insurance company. And although it might be considered a futile gesture to launch so tiny and frail a communication into so much savagely indifferent water, you had to admit it showed a bit of class. A random particle of optimism fired blindly into infinity in the hope of hitting the bull, of achieving something worthwhile. The fact of death and the promise of hope; between the two of them mortals had a rough time of it, and they coped remarkably well.

Through the opaque green glass, Kiss could see a scrap of paper neatly folded and tucked in underneath the cork. His heart unaccountably high, he dived and picked the bottle out of the water as neatly as a Japanese fisherman’s, cormorant. Pop went the cork (not whoosh, this time) and he unfolded the message, which said:

“Marvellous,” said Kiss disgustedly; and he was reflecting bitterly on the nature of anticlimax when an idea struck him.

A message in a bottle. Yes, why not?

Without giving himself time to think, he jumped down through the neck of the bottle and dragged the cork in tight after him. Then he leaned back, smiling contentedly, waiting to see what would happen next.