Urban centers for octopuses

I am imagining a water covered planet. There could be a few pieces of land scattered here and there, but >99% of the planet's surface is water. There are various ecosystems and biospheres where a race of super intelligent octopus-like creatures have risen the evolutionary ladder. The steps it took to get there don't need to be explained unless you feel like it.

These creatures have pretty much the same physical and emotional needs and are social creatures just like us, only octopus shaped (meaning soft, invertebrate with extremely dexterous tentacles (I guess 8, but can be more or less)). Assuming that they have evolved to be technologically equal to present day humans AND that on a whole they decided that permanent shelters where a good idea, how would their urban centers differ from ours? Mainly, how would the construction of the buildings differ? Would it be more efficient to anchor them to the sea floor or to a floating buoy? What would be a possible building material (I'm unsure on how pouring concrete underwater works)?

Bonus question: In this world, suppose an earthling human felt like taking a vacation in one of this underwater world's best 5 starfish hotels (He is the first non-aquatic being to visit this planet). What should he pack (other than scuba gear and extra oxygen tanks) to have a great holiday full of high-jinx?

posted over 8 years ago

mlurette‭

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