We have floating blocks and all that. But what if we could go underwater like a sub, a special block to make us go down under water and up. Under the water could be coral, and fish etc. also could do with a rudder so we can make boats easier to turn and even a boat motor.
Do you have any ideas on anything to do with watercraft in simpleplanes. Please leave comments.
Thanks
Caveman

I have just had another good one: waves and a ballast to keep it stable. And weather conditions.