These are two purple people from Pluto. Itka is the man and Litka is the woman. They are co-captains of a spaceship. They've been coming to earth for the last several years to masked balls. The ball in Vienna, Austria, was their favorite.
They would come on Fashing which is what they call it in Europe (We call it Mardi Gras in the U.S.) to familiarize themselves with earthlings for the past one hundred years. They learned to change themselves to look more like earthlings.
On this trip, they thought that they landed on a green piece of grass but it was quick sand. Itka and Litka jumped to get out and managed to survive. The rest of the crew went down.
In the jungle, they hear chimps, elephants and lions. It has a hot and humid smell. They are in the Amazon.
They meet a native boy from a nearby village and ask for help. The boy brings back other natives. Itka shows them where the ship went down. The natives call it "the hole of no return." They're playing. The boy has an idea to bring a white man to look at it. They get construction equipment--an excavator--and dig it out of the quick sand.
They find some of their comrades still alive. Itka breathes into their nostrils to revive them. The spaceship is functioning again and they take off.