Finike Suluin Cave

Suluin Cave is an underwater cave located within the boundaries of the Finike district in Antalya, on the southern coast of Türkiye in the Mediterranean Region. It is situated approximately one kilometre west of the Finike district centre, along the Finike-Demre highway. The cave is also known locally as “İncirli Cave” or “Gök Mağara”. Noted for both its natural morphology and the structural features identified through research, this cave is regarded as one of Türkiye’s significant karstic and sea-connected cave systems.

^{Suluin Mağarası (}T.C. Finike Kaymakamlığı⁾

One of the most striking physical features of the cave is its entrance opening, which spans approximately 80 metres in width. This dimension renders the cave unique not only within Antalya but also at the national and continental Asian level. The full length and depth of the cave have not yet been precisely determined. Various research dives conducted inside the cave have measured its depth up to 122 metres, but its ultimate boundaries remain unexplored. This highlights the structural complexity and natural accessibility challenges of Suluin Cave.

Observations within the interior sections of the cave have revealed the presence of various natural formations, including travertine pools, stalactites, and limestone deposits formed on the walls. One such interior area is a spacious chamber located at a depth of approximately 45 metres, which is among the most prominent volumetric voids identified during cave investigations.

Hydrologically, the cave’s internal water structure exhibits two distinct characteristics simultaneously. Freshwater is encountered near the entrance, while salinity increases with depth, taking on the characteristics of seawater. This dual structure supports scientific hypotheses suggesting a subterranean connection between the cave and the Mediterranean Sea. The water temperature remains consistently around 13–14 °C throughout the year. Additionally, the cave water has an acidic character, and in deeper sections, a smell resembling hydrogen sulfide can be detected. This indicates the presence of specific biogeochemical processes within the cave environment and the occurrence of gas accumulation in certain areas.

^{Suluin Mağarası (}T.C. Finike Kaymakamlığı⁾

One of the most significant scientific diving activities related to Suluin Cave took place on 27 August 1995. A submarine research team from the United States reached a depth of 122 metres within the cave. However, during this dive, two divers lost their lives. Following the incident, the cave was closed to the public and amateur divers, and access is now restricted exclusively to professional teams conducting scientific research or operating under special permits. This underscores the extreme hazards associated with accessing the cave.

^{Suluin Mağarası (}T.C. Finike Kaymakamlığı⁾

Archaeological evidence within the cave includes traces of human activity from past periods. In particular, fragments of pottery and bone remains have been found in certain sections of the cave. These discoveries suggest that the cave once existed in a terrestrial environment and was used by humans, either temporarily or permanently. In this context, the cave is not only a geological and hydrological feature but also a site of archaeological potential.

Today, Suluin Cave is recognized as one of the important natural formations of the Finike district. Although access to the cave is prohibited outside of scientific research, the site is protected at both local and national levels, and relevant authorities have implemented various measures to preserve its natural integrity.