A 16-year-old boy and 40-year-old man have died after a blue Mercedes left the road and became submerged in water.
Police said the collision – reported at 1.33pm on Saturday – happened when the car left the road at Tetney Lock Road in Tetney, Lincolnshire.
Officers, Lincolnshire Fire and Rescue, and East Midlands Ambulance Service crews were all sent to the incident.
The pair were pronounced dead at the scene.
Their next of kin have been informed and are being supported by specially-trained officers, Lincolnshire Police said.
At this stage, it is not believed any other vehicles were involved.
Diversions were put in place at Tetney Lock Road junction with Hoop End and at the junction with New Delights, before the road opened at around 3am.
Police are now appealing for any information on the incident, particularly from those who may have seen the Mercedes 300 and have dashcam footage between 12.30pm and 1.33pm on Saturday.
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