To dream that you are diving into clear water suggests that there will be closure of a humiliating issue. You will endure some trouble, but things will work out in the end. This dream could also suggest that you are working to uncover the root of a difficult situation. It could also be representative of your subconscious.
To dream about diving into muddy water indicates that your dealings will cause your grief and stress.
To witness others diving in your dream signifies a sense of harmony with your feelings and mental stability.
To dream of animals diving indicates that you are digging into your primal and sexual desires that have usually been kept hidden.