Dipity timeline of lord arthur

http://www.dipity.com/phamtom/Lord-Alfreds-life/

 Lord arthur is a britanic poet. He wrote a poem called the kraken, which ill analyze right next.
This poem uses iambic pentameter, like in the next verse: "Below the thunders of the upper deep"
What does the kraken mean? We could say it is literally a kraken, a mythical anymal that lives down the sea. Following the lyrics, that is what suggests.