Interesting documentary that includes historical discoveries about steel-making, diesel engine, hull drag and so on.
At 13:46 they talk about improved hull efficiency by "lubricating" the bow with microbubbles.
The azimuth pods that allow the propellers to swivel 360 degrees look like they face the wrong way, propellers first. But allowing the propellers to cut through undisturbed water makes them more efficient. "The pod's propeller usually faces forward because in this pulling (or tractor) configuration the propeller is more efficient due to operation in undisturbed flow."
https://en.m.wikipedia.org/wiki/Azipod
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