If the Orlando's sonar man heard the Stingray's crew singing, wouldn't he have also heard Dodge giving instructions to the crew over the speaker before hand? Or Sonar announcing that the trick had worked and the crew cheering?
Think about it. If you were observing this nutty planet, would YOU make contact?
I don't know how close a modern sonar system has to be, ship-to-ship wise, to pick up clear individual speech patterns, but I think we all, as novices, could pick out a crowd singing Louie, Louie against almost any background noise.
Also, I recall Sonar saying something to the effect that the Orlando was leaving "fast and noisy," and then the crew cheered. I'm assuming that there are different running modes on subs that allows them to mute their engine noise in varying degrees, so if its considered safe the Orlando's skipper just ordered the engines at full tilt to make up speed and the running noise be damned.
Good points, ramfrommaine. I hadn't considered proximity. When Sonar heard the 45 cents dropped, the Orlando was very close to the Stingray. When Dodge turned her into a "fishing trawler", though, she was considerably farther away. And you're right about the Stingray's crew cheering AFTER Orlando went "fast & noisy". Hadn't considered that, either. I'm kinda slow sometimes. Thanks for the reply.
Think about it. If you were observing this nutty planet, would YOU make contact?
You wouldn't be able to hear anything, of course. When the sound waves hit the water it would be unintelligible to the untrained ear and would definitely not sound like a merely muffled rendition of the song. It's a comedy so it's excusable..