The two crossword solutions for the term 'Marine Threat' are ORCA and BERG. An ORCA, also known as a killer whale, is a large marine mammal that is found in all of the world's oceans. Orcas are apex predators, meaning they are at the top of the food chain and have no natural predators. A berg is a large mass of floating ice that is found in the Arctic and Antarctic oceans. Berg can be dangerous to ships and other vessels due to their size and unpredictability.