Now, the company has launched an incredible-looking tourist sub that can take 24 passengers, a pilot and a co-pilot down to 100-meter (328-ft) depths in air-conditioned comfort, providing panoramic views of the aquatic world through colossal 5.5-inch-thick (140-mm) acrylic windows. Where other subs offer restricted views, this thing is very close to a giant transparent tube, like a glass walkway through an aquarium, tall enough to stand in.

The DeepView 24 is the first of a range of DeepView tourist submarines that can be specified in different lengths to accommodate between 12 and 66 passengers. Additional sections can be added six seats at a time; with the 24-seat version already 15.4 m (50.5 ft) in length and weighing 121,250 lb (55,000 kg), a 66-seater would certainly be a sight to behold and a pain in the butt to pull a u-turn in.

The DeepView sub design can be extended in six-seat sections – this Vinpearl customer sub is a 24-seater, but the design can extend up to an incredible 66 seats. Juan Camilo Moreno/Triton Submarines

Unlike the Deepflight Dragon 2-seater, which operates more or less like an upside-down underwater quadcopter and maintains positive buoyancy so it'll float to the surface if the power cuts out, the DeepView uses nearly 4,000 lb (1,800 kg) of variable ballast in addition to 8,820 lb (4,000 kg) of fixed main ballast to control rise and fall.