Omega, welcome to the open water events in 2019
The finish line is watched with four high-speed cameras, each at 100-frames per second. Then there can be a video review of the exact order of finish.
Strange that some races have the swimmers going a 10K distance, or even a 5K distance, and have the finish boil down to fractions of a seconds.
The swimmers travel under the super-structure that looks like a bridge and then they reach upwards, out of the water, and touch the pads to record their finish.
Other options with AutoCoach
Another option if you don't have all that money to invest into the rental of the Omega equipment, is to deploy an AutoCoach Timing System. The AutoCoach system is used at Cross Country Track Meets, That would capture the time of the race, but there would need to be a timer. More on that to come in the future.
A four camera security system can also be deployed to watch for the numbers on the swimmers' caps.