Source: The Great Interpretation of Dreams (Ibn Sirin)
Diving in the sea indicates entering the service of the ruler or seeking knowledge. If one brings out pearls, he will gain wealth or knowledge.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
Diving indicates striving in a dangerous matter. If the water is clear, it is striving for good. If it is murky, it is striving for evil.
Source: Signs in the Science of Expressions (Ibn Shaheen)
Diving is interpreted as worry. Whoever sees himself diving will be afflicted with worry.