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2023-02-22 
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Fortunately, nature solved this issue, and the kingfisher can dive gracefully into the water with little to no splash.
Nature perfected this design over many years, but Japanese engineers didn't have that time to come up with a solution, to their bullet train's sonic booms.
It is the early nineties and Japanese engineers are trying to solve one of their biggest problems... tunnel sonic booms.
One of the world's busiest high speed rail lines is called Tokaido shinkansen, it had moved billions of passengers since its opening in 1964, however, at the time, it was first designed and was also well known for disturbing thousands of nearby residents as it emerged from tunnels.
The bullet train travels through Japan, 150-200 Miles per hour. Unfortunately for the local people, the train design didn't consider how the train's high speed would cause atmospheric pressure waves to build up in front of the train as it passed through tunnels.
this compression wave propagates through the tunnel at the speed of sound forming a micro pressure wave or a tunnel sonic boom at the exit.
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