You’ll have to tolerate a robot voice here, but the video is only 5 minutes long. Some people can’t handle even that much.
YT description: In 1987 a Japanese team from Waseda University (Tokyo), under the direction of Sakuji Yoshimura carried out an electromagnetic sounding survey of the Khufu Pyramid and Sphinx and found SEVERAL cavities and tunnels. Rare images of the Great Sphinx suggests there are several intricate entrances.
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Title: Rare images show how to access Secret Chambers beneath the Sphinx (YT link) Uploaded by UFOmania.