Why did sea monsters have long necks?

From the journal Science: A recently found fossil represents a new species of ancient marine reptile, and researchers think its long neck may have helped it hunt prey stealthily.
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Tanystropheus had a disproportionate neck three times its body length — but why?

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A Sea Monster Emerging from the Water, Its Long Neck and Head Stretching Towards the Sky Stock Illustration - Illustration of huge, generative: 273843834

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Long-necked reptiles, Tanystropheus, were easily decapitated by dinosaur predators •

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Why did sea monsters have long necks?

Sea monsters really DO exist, scientists claim

Long-necked Sea Serpent