On the water, perched on rooftops and operating AI-augmented cameras, French security forces will lock down central Paris during the opening ceremony of the Olympics on Friday aiming to prevent an incident that would ruin the biggest show on earth.

The figures tell only part of the story of the colossal effort made to protect the river parade along the Seine, the first time a Summer Olympics has started outside a stadium. About 45,000 police and paramilitary officers will be on duty, along with 10,000 soldiers and 20,000 private security guards.