The panorama was made by the company "Professional Acceptance of Real Estate" when checking a country house before buying https://www.prof-priemka.ru/services/obsledovanie-doma-pered-pokupk/
How to create a virtual 3D tour? Step-by-step instruction
The order is as follows: 1) upload to the site spherical panoramas from which you plan to create a virtual tour; 2) from the list of uploaded panoramas add each panorama to the virtual tour (Add to 3D tour link); 3) open the created virtual tour, edit the panorama order, select the main panorama, set transition points (tunnels).
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