NR-1 Sinkhole interest, as sinkholes are generally believed to form only in environments which are subaerial, or exposed to the air. In contrast, the NR-1 Sinkhole is believed to be too deep underwater for the area to have been exposed to the air during formation in the Neogene. It was the first documented evidence suggesting that it is possible for karst sinkholes to form entirely underwater. NR-1 Sinkhole The NR-1 Sinkhole is a giant underwater sinkhole located in the Straits of Florida southwest of Key West, Florida. It is found at an approximate depth of of water at the foot of the
Akhayat sinkhole site presently there is no touristic activity. But Silifke governor said that the site will be opened to tourism. Akhayat sinkhole Akhayat (also known as Aşağı Dünya Obruğu) is a sinkhole in Mersin Province, Turkey. The Akhayat Sinkhole is located in a rural area of the Silifke district, to the north of Atayurt town. Its visitors (if there are any) are often from Mersin, and to get to the sinkhole site they follow the Turkish state highway . As for tourism nowadays, it isn't a particularly popular sight, as there is hardly any touristic activity apart from people driving past