[deathcakes]

The point the GP is making, from the books that he mentions, is that being an underwater species precludes the discovery of fire, which is the basis for many technological innovations. It is possible that there are other technological routes around this, but the barrier to entry is much higher.

[sbirchall]

Yes, this is what I was angling for. I think it's a pre-occupation of many of the species in IMBs Culture series if I remember correctly. Where those species that went the long way round (mostly water dwellers) hold species like us in something like contempt.

Apologies to 'jacquesm: https://news.ycombinator.com/item?id=7721134

[Snail_Commando]

I wonder if an advanced aquatic species could/would make use of hydrothermal vents to harness the some of the transformative properties of fire. Hydrothermal vents lack the property of mobility, yet have the properties of persistence and predictability.

If one thinks of fire as a common evolutionary ancestor of all human technology; I wonder if there is, in the same sense of fire on land, a branching point of technological evolution in an aquatic society; a branching point that humans do not comprehend, acknowledge, or notice.