Coastal caves are those that are developed along the coast as an outcome of the interaction with terrestrial and marine processes. Sea level can oscillate, both globally as well as domestically, and thus alters the site of coastal cave development through time. First, waves and salt attack on any rocky coast which turn up in simple hollows and chambers, called sea caves or littoral caves, in a variety of rock materials. Second, on limestone coasts, the dissolution of the rock by mixing the fresh water and sea water can create complex cave systems called flank margin caves. Blue holes also form in limestone coastal. Safe cave survey in any environment setting necessitates training and preparation, while flank margin caves are relatively safe, the exploration of sea caves and blue holes can be extremely dangerous even for those who experience it in a year.Waves colliding against the base of a cliff can often form a sea cave. Sea caves also develop along a splinter in a rock or a region where the rock is softer. Since the abrasive action of waves is distilled at the base of the cliff, an overhang develops.