system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do people die from jumping off a bridge into a river?

Do they force themselves to drown or does the impact kill them? Could they have second thoughts and swim to safety? Is there a natural current under bridges that pulls them underwater and keeps them there?
gpt
Typically it is the impact that kills them.
The surface tension on the water from a very high fall would feel just as hard as if landing on concrete. 
That's why divers must use their fingertips to enter the water first to break the surface tension and allow for a smooth entrance. 
If high divers did a belly flop it could do loads of damage.