... the invention of Maximilian Simchen (16). His submarine consists solely of DIY store and scrap parts. The young researcher had set himself the goal of building a model with a compressed air diving system that regulates a change in weight through its diving height. Instead of the 2,250 euros that a professional model costs, Maximilian Simchen set himself a limit of 200 euros. In the end, the material costs amounted to 184 euros. However, the submersible model still lacks a drive and rudder system. But the submarine builder is optimistic - there are still 16 euros left.