What does a "Colossal squid" eat?

Colossal squid, also called Antarctic cranch squid, live near Antarctic at depths of a mile or even two miles. Scientists do not know what it eats. Juveniles are prey for elephant seals and grown ups are preyed upon by sperm whales and very large sleeper sharks. The speculate they eat some of the giant varieties of fish found near the bottom of the earth that school in large numbers and are five times larger than the same fish found in temperate climates. Don't recall the exact species but similar looking to very large b.