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 wine which Paparanic gave him while visiting him last Christmas, and told him to drink after his death. On the way down from the mountain, Haddock accidentally breaks the bottle, the label of which turns out to be that of a map, obviously showing the location of Paparanic's gold. Tintin and Haddock return to the Golden Fleece, where they discover that they have been joined by their friend Professor Cuthbert Calculus. Secretly, Yefima drains the oil out of the engines in order to prevent the ship from leaving port but Tintin discovers him, and after Tintin throws him overboard he