Corrected entry: Nothing in space could communicate with whales in the ocean without radios. It wouldn't matter if it was generating the loudest sound in the universe, or had the most sensitive mike and most powerful amplifier - sound can't travel through a vacuum. The probe couldn't "hear" the whales, and the whales couldn't hear the probe.
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Correction: This assumes that the probe, which does not appear to be a 'mechanical' device, uses a communications technology that we are familiar with, and there's no reason to assume that it does. It's a fictional, alien probe, which is likely using a fictional, alien technology to communicate with the whales.
wizard_of_gore ★
You're describing fantasy fiction and not science fiction. The whales are not equipped with alien technology to send and receive, so it doesn't matter what technology the probe contains The movie makes a point of "playing" the sounds of whales and the sounds of the probe. Sounds, by definition, are vibrations of a medium - there is no medium here to carry the vibrations, and even if there were, they would have to be so powerful as to cause worldwide, catastrophic shock waves in order to reach.
ReRyRo
Star Trek does often dabble in fantasy under the guise of "too advanced for our puny minds." The probe's signal is not itself a sound but some kind of energy (or something) that can inexplicably drain power from starships, cause giant hurricanes, and produce a sound when it hits a medium. The probe presumably has sensors that can detect the effects of a whale call and extrapolate/ "hear" it much the way the Enterprise bridge screen can "see" across vast distances using sensor data.
TonyPH