Diving into water in a dream is interpreted as benefit and sustenance. If a person sees in his dream that he is diving into sea water and getting mud from the bottom of the sea, that person will be subjected to sadness and grief.
Anyone who sees that he is diving into a river and cannot get out of it will not be patient with the harm that will happen to him. If a person sees himself diving into the sea for pearls or something else, it is interpreted that that person wants knowledge or wealth and similar things. That person acquires knowledge or wealth according to the amount of what he obtains from fine or other things.