• I'm on a boat in the middle of the ocean in the middle of the night and it's pitch black. There is a spotlight on the boat, so that's all I can see in the darkness. I'm wearing a wetsuit and diving gear, and I have a little headlamp on my head. I realize I'm not alone, as there is another girl with me. I don't recognize her but she's also wearing diving gear, a wetsuit, and a headlamp. She turns on her headlamp and motions for me to do the same. She asks if I'm ready, then sits on the side of the boat and flips herself backward into the pitch black ocean. For some insane reason, I do the same. It takes me a minute to find her because it's so dark, but then I see the light from her headlamp down below me. I swim deeper trying to catch up with her. She swims down until she finds a small opening of a cave. She goes in the opening, and there's barely enough room for her to fit. I don't want to be left alone there so I follow her. We swim for what seems like forever and then it opens up into a huge underwater cavern. I can only see what's in the way of my little headlamp. I look all around but can't find the other girl. I can feel things moving all around me. I can feel the water moving. I feel movement in the water behind me, so I whip around hoping it's the girl. Instead I am face-to-face with a HUGE, terrifying, monster fish that is about to attack me, and then I wake up.

Meanings from dreammoods.com dream dictionary.

• Darkness = "To dream that darkness comes upon you, signifies failure in some work that you are attempting. Darkness is synonymous with ignorance, the unconscious, evil, death, and fear of the unknown. If the sun breaks through the darkness, then you will overcome your failures. If you feel safe in the dark, then it suggests that you like not knowing about certain things. As some might say, ignorance is bliss. To dream that you cannot find someone in the darkness, signifies that you need to keep your temper in check. You have the tendency to let your emotions get out of control and lose your temper. To dream that you are lost in the darkness, denotes feelings of desperation, depression, or insecurity. To dream that you are groping around in the darkness, indicates that you have insufficient information to make a clear decision. Do your research and do not rush into making choices."
• Ocean = "To see an ocean in your dream, represents the state of your emotions and feelings. It is indicative of some spiritual refreshment, tranquility and renewal."
• Boat = "To dream that you are in or see a boat, signifies your ability to cope with and express your emotions. Pay particular attention to the condition and state of the waters, whether is is calm or violent, clear or murky, etc. Are you "smooth sailing"? Alternatively, you may be ready to confront your unconscious and unknown aspects of yourself. To dream that you are trying to jump off a boat, suggests that you want to confront those difficult emotions and approach your problems head on."
• Stranger = "To see a stranger in your dream, signifies a part of yourself that is repressed and hidden. Alternatively, it symbolizes the archetypal dream helper who is trying to offer some insight and advice."
• Diving = "To dream that you are diving into clear water, signifies an end to an embarrassing situation. Although you may experience some temporary setbacks, things will surely look up. You are ready for the next phase in your life. Alternatively, the dream indicates that you are trying to get to the bottom of a current situation or the root of your problems or feelings. It may also refer exploration of your unconscious. To dream that you are diving into muddy water, signifies that you will suffer anxiety from the path of your affairs. To see others diving in your dream, represents psychological and emotional balance. To see animals diving in your dream, suggests that are exploring your instinctual and sexual urges which you have previously suppressed into your unconscious."
• Cave = "To see or dream that you are in a cave, symbolize the womb and thus signify refuge, protection and concealment. To dream that you are walking in a dark cave, represents an exploration of your unconscious mind. It signals self discovery."
• Monster = "To dream that you are chased or followed by a monster, represents aspects of yourself that you find repulsive and ugly. You may possess some fears or some repressed emotions. Try to confront the monster in your dream and figure out who or what aspect of yourself the monster represents."
• Fish = "To see fish swimming in your dream, signifies insights from your unconscious mind. Thus to catch a fish, represents insights which have been brought to the surface. Alternatively, a fish swimming in your dream may symbolize conception. Some women dream of swimming fish when they get pregnant. The fish is also an ancient symbol of Christianity and Christian beliefs. Consider also the common phrases "like a cold fish", "fish out of water" or something that is "fishy" about a situation. It may also imply a slippery or elusive situation."