“Ocean marvels are seen from the underwater bus!” The underwater tour bus rolls on tractor treads beneath the surface of shallow waters. But the claustrophobic tourist needn’t worry about getting trapped. The passenger compartment can be instantly released from the undercarriage to float to safety in case of breakdown.

The inventor was an engineer from Nice in the south of France who believed sightseeing trips like this were the way forward. He also developed an underwater railroad for cable-drawn carriages. And the all-important matter of oxygen? By bus or by rail, your air will be funneled to you through telescoping pipes that reach above the waves.”