When the tour group is viewing the whales from above and it it sprays water from it's blow hole there is a small amount of smoke (you can tell the difference from water spray by the way it drifts out) that trails out after the initial spray possibly from the charge used to propel the water from the prop whale blow hole.

Film

Star Trek IV - Rotta verso la Terra (1986)

Persone

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SerieTv

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