In the last minutes of Titanic, after the ship sinks. Those who survive on the lifeboats have to make a choice.
Come back and try to fill the extra space they have and save a few people? Or just stay where they are and let them die? Easy choice, right? Wrong! The problem is that if there are too many survivors, they will all try to get on the boats and overcrowd them, leading to the death of everyone. But if you wait too long, everyone in the water will freeze and you won't be able to save anyone.
What you want to do is a version of what they tried to do in the Titanic, distribute people so you send in empty boats and keep the full ones away. Unfortunately, they took too long and most died.
Perhaps you can wait, a bit. And then slowly approach, in order to get a better view of the swimmers? And then decide whether to go further in, stay where you are and yell, or flee, depending on how many there are?
