Wikipedia:Reference desk/Archives/Miscellaneous/2022 October 9

= October 9 =

Looking for sources for information
Good afternoon, all. Looking for sources for this information: "In the Rhodope Mountains, an underground cavity was discovered at a depth of 2,400 meters during drilling." Does anyone know where the information is from? Thank you in advance. Vyacheslav84 (talk) 16:32, 9 October 2022 (UTC)
 * For what it's worth, this sentence (when googled) shows up in several Russian tourist/travel-type websites, which is presumably where the OP found it. The obvious first step would be for the OP (or another Russian-speaking editor) to contact those websites and ask them. {The poster formerly known as 87.81.230.195} 90.195.172.49 (talk) 16:57, 10 October 2022 (UTC)