Interesting idea. Cereal could provide biofuel if processed, but the energy density is low; we'd need a large storage area, which might compromise buoyancy. We could also use the waste to power a small turbine, feeding the weather sensors. The paradox is that the submarine would need to be as quiet as possible, so the machinery must be highly efficient. Perhaps a modular approach would let us swap components. What do you think about starting with a prototype that uses a small amount of cereal to test the concept?

Sounds like a fun experiment, but I keep thinking about the balance. A tiny hull will be hard to keep stable with a toaster inside, and the noise from a small turbine could be louder than a rubber duck. Maybe we should test the power output of a single cereal grain first—if it can keep a tiny LED on, that’s a start. I’m excited to see what you find in those magazines, but we’ll need a solid plan for how to keep everything quiet and efficient. How about we sketch a list of required parts before we start scavenging?

Great plan, but I keep thinking about the fan’s placement. If we hide it inside the toaster shell, we’ll still have to worry about heat and airflow. Also, a glue gun might melt the fan blades. Maybe use a tiny heat‑resistant silicone seal instead. And for the magazine search, I’d suggest looking at the “engineering” section of those old comics—sometimes they have weird gadget diagrams that might hint at low‑noise motors. Let’s list the exact sizes we need, then test a grain‑fuel cell with a small LED first. That way we’ll have concrete numbers to work with. What do you think?