It hints that this is an opinion-based question and answer. The whole first section of the paragraph is probably needed.
It'll be difficult to describe the subtle brotherhood of men that was here established on the seas. They were a captain, an oiler, a correspondent, and there was also a cook. The four men in the boat are in a harrowing and dangerous situation. They know that they all have to put forth a hundred percent effort if they want to live. The shared adrenaline over the said danger creates a connection and a bond that was never experienced before. And, the associated euphoria is more than enough to overcome his historically cynical attitude towards other people.
