Could we use 'COULD HAVE' for speculation in the past ? Are the examples below correct?

In the very heart of Europe, Austria is a country which could have been created with activity holidays in mind.

A source involved in the investigation says airline could have broken up at around 35000 feet.

Though the drain was barely 2 feet deep, the water pressure could have pushed him into the reservoir


That usage is correct. In all contexts, the past modal "could have" is speculating about the past.

In your second example, however, I think you are missing the article "the", and I'd recommend using "airplane" or "plane" instead of "airline"


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