To dream that you are diving into clear water indicates that you have overcome your obstacles and setbacks. You have a new sense of confidence. Things are looking up. 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 subconscious.
To dream that you are diving into muddy water suggests that you are feeling anxious about how you have handled certain issues in your waking life.
To see others diving in your dream represents psychological and emotional balance.
To see animals diving in your dream suggest that are exploring your instinctual and sexual urges which have been previously suppressed into your subconscious.