Napoleon's body is said to have not rotted, and it is basically well preserved in the natural environment. But when he was buried, he fell into the hands of the British. The British only arranged an ordinary military funeral for him, and the coffin was relatively simple. When he was moved and buried in 1840, although the French intended to bury the emperor with a national ceremony, the body obviously could not stand the move, so they had to put a gorgeous coffin on the outer layer of the original coffin. This coffin is now in the Invalides in Paris. The outermost layer is crimson rock, weighing 30 tons, and the contents are invisible. In addition, there was no custom and technology to preserve the remains of great men with crystal coffins in the Napoleonic era. However, Napoleon had a mask to watch, which was made by his marshal immediately after his death, and it was his true face.