To dream of an iceberg represents larger or more significant unconscious issues and unresolved problems. Powerful deep rooted unconscious influences, or uncertainties that you have completely forgotten or ignored. Larger problems you can’t do anything about.
Icebergs reflect a need to carefully handle a situation and point to problems that are too big to solve without help or preparation.
To dream of an iceberg that breaks represents larger issues or problems that are losing strength. A big problem may be providing opportunities to deal with it.