The 43-year-old worker suffocated after 5 tonnes of grapes fell from a loading hopper at a vineyard in Tomelloso in central Spain.
Emergency service workers were called in after the incident, which took place at around 9pm on Thursday.
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They were, however, unable to resuscitate the man.
He was pronounced dead at the scene at 10.30pm.
Tomelloso is considered the capital of wine growing in Spain's Castile–La Mancha region.