Question

I have a picture of a boat sailing over a wave. I have arrow A at the front of the boat going down to the ocean floor and there's the boat at the bottom, which is marked B, the arrow then starts back up to the back of the boat and is labeled C. They want to know what is happening in the picture and I have no idea. Anyone that can help would be greatly appreciated.
What is the context of this picture? Where is it in relation to the textual material?

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