On the climax of our longing come, is a metaphor to represent how badly the people on this cruise (if we continue on that other metaphor) desire to be freed from their sadness or depression. It seems like the dolphins they're looking out for, the symbol of hope is what they are waiting fro. On the climax means that they're reaching the end of thier patience.
Smiling, snub-nosed, doomed like satyrs. This quote expresses alot for various reasons. It admits these people are faking happiness, Snub-nosed then meaning they have little hope left and or have little happiness in them. The last is th emost powerful one since its areference to greek mythology, to beings that searched thier whole lives for something they never found.
In black water. We had not seen the dolphins. This quote talks about the end of the journe when they return back to the city. It's almost like a dream and returning to reality. In balck watermeans that they're still stuck where they came from, they are still depressed.