> As such, the number of intelligent underwater civilizations, that could get near our present level of advancement, would likely be significantly lower. Unles

> As such, the number of intelligent underwater civilizations, that could get near our present level of advancement, would likely be significantly lower. Unless of course, having opposable thumbs and >50 year lifespan and intelligence in the water causes you to go through a completely different developmental path than land based creatures. We just don't know.