It’s the Titanic.
The scene where Rose and Jack have found a wooden panel floating near the wreck, but there isn’t room for both of them. Jack makes Rose promise that she’ll survive, and never give up, no matter what happens, and then he slips into the water and disappears. Oh dear.
You probably don’t really want to watch the distressing scene, unless to check how very vividly Ruffy has recreated it. You can just see that courgette vanishing under the waves.