The phrase "What if we drown" appears primarily as the title of a New Adult book by Sarah Sprinz. The book is about a young woman named Laurie who seeks a fresh start after the tragic death of her brother by moving to the west coast of Canada to start medical studies. The story explores themes of grief, new beginnings, and relationships, especially her connection with a medical student named Sam who is connected to her brother's death. This is the first book in the "What If" series and deals emotionally and realistically with the concept of loss and moving forward in life.
If the question "what if we drown" is interpreted literally—concerning the act of drowning—please clarify, and I can provide information about the physiological and survival aspects of drowning.