Come to this cost-effective small country to see the sea, Montenegro is an unknown European country, but it has a fascinating scenery and rhythm of life. Today, the tour guide took us to the famous blue hole in the local area. The blue hole is located at sea, so we can only take a boat. The Blue Hole is open all day, but if the weather is bad, the boat family will not leave the boat. We boarded the yacht and started our Blue Hole trip. The captain is a very enthusiastic local and has been introducing us. We were in the sea, surrounded by mountains and buildings, and several uncles and aunts in the same boat picked up their mobile phones and started to take a meal. In front of it was a cave, the hole was narrow, and we drove in slowly. I didn't expect the cave to be quite big, and it would be no problem to accommodate three speedboats. This is a natural cave, especially ancient, and the side of the rock wall is green. The cave is very cool. Because natural light can shine in, it doesn't matter whether you bring a flashlight or not. When I first came in, the sun was the most abundant. I saw that the water at the bottom of the boat was green like an emerald, sparkling. I also wondered, it is a blue hole, how the water is green. The boat slowly advanced, and the sun could only shine on the middle part of the water. At this time, I finally saw the blue water, like the highest purity sapphire in the world, and like the mini version of the Danube. The boat rippled slightly with the waves. I saw the exit very quickly. The whole blue hole was short and quickly scanned, but that beauty was straight to the heart.