What is the climax in the memoir, Wave?

This story is unique in that one climax (the scene in which the tsunami comes and takes Deraniyagala’s family) occurs at the beginning of the book. This event sets the story in motion and gives the reader a sense of how quickly the tsunami came and how unprepared Deraniyagala and her family were for it.

The book has another climax in Part 8 where Deraniyagala describes going on a whale watching tour and realizing that she was able to bully her memories to the point that they left her alone and she could enjoy the trip even though her son, who loved whales, was not there.