Argonautica only defended by birds. They fight off the birds and then chance upon four survivors of a shipwreck. These are the four sons of the exiled Greek hero, Phrixus, and they are also grandsons of Aetes, king of Colchis. Jason welcomes them as god-sent allies in his quest for the Golden Fleece. Approaching Colchis, the Argonauts see the eagle of Zeus flying to and from the Caucasus mountains, where it feeds on the liver of Prometheus. It glides through the air as large as another ship, disturbing the Argo's sails as it passes overhead. Soon after, the heroes enter the
Tintin and the Golden Fleece swims away, but fortunately Calculus has invented a special tablet called "Super-Cuthbertoleum" which, mixed with the remaining fuel, is more than enough to get the boat started and enables them to reach their destination, the island of Thassika. The map includes an X just off the island's coast and, using his pendulum, Calculus locates the gold's location. Swimming underwater, Tintin discovers a chest filled with strange dark bars but which he guesses is the gold which has been painted over. No sooner have the members of the Golden Fleece got the chest out of the water that they are held