What's interesting about this image is how the title, Unexplored, fits in. The image is taken from what I expect is a cavern, but faces out to the ocean and sky, suggesting these are the things that are unexplored. You also elaborate very well on this by focusing on the internal structure of the icicles, with bubbles inside, as if they are also their own world. So thematically, your message comes across and the image is meaningful to me (even if you didn't intend).
There is a slight problem with your visuals though, because my gaze is drawn to the intersection of the sea, sky, and land about 2/3 down the image. This is kind of confusing because this area is not in focus. The icicles you did focus on are way up top, far removed from the meat of the picture, so the focal point is a bit unclear. The image also appears to be slightly rotated, ie the horizon line, and this seems a little clumsy.
Overall, great visuals. It's very subdued and cool imagery. The only problem is I am a bit unsure what the image is really about... if that makes sense. It's a beautiful landscape for sure, but I don't know what to make of it. Its a bit more jumbled that I would like, but maybe that's just that I really enjoy minimalism in my landscape scenes.