The term 'BLUE DEEP' can be broken down into three crossword solutions: OCEAN (5 letters), SEA (3 letters), and BASS (4 letters). OCEAN is a large body of water that covers most of the Earth's surface, while SEA is a smaller body of salt water that is partially enclosed by land. BASS is a type of fish that is found in both oceans and seas. All three terms refer to the deep blue color of the water, which is caused by the absorption of sunlight by the water molecules.