Water in the Bible represents true ideas about natural, external things – day-to-day life and physical existence. The sea represents the whole collection we have of these natural truths (to use a common term from the Writings). Those representations – like all other representations in the Bible – can be negative as well as positive; the water in the sea can also represent false thinking and twisted logic. This is especially true when a storm stirs up the sea and causes waves; the waves represent arguments which come from false and twisted thinking and which attack our belief in what's true. In most cases this comes in the form of temptation, when false thinking attempts to link up with our evil desires and convince us that it's OK – and even good – to go ahead and do what we want.

(Verweise: The Apocalypse Explained 419 [23-24], 538 [5])