1. Tools made of bone or very hard stone. 2. Different type of oxidation. 3. Work with air bubbles; people fished and dived since time immemorial not being ab

1. Tools made of bone or very hard stone. 2. Different type of oxidation. 3. Work with air bubbles; people fished and dived since time immemorial not being able to survive underwater. 4. No one said the ocean has to be a water ocean, how about ammonia? 5. The first space launches of the hypothetical aquatic species may involve air-breathing animals, or it may be delayed until the automation reached a sufficiently high level. The technological path is not linear. For example, the Aztecs had advanced societies and infrastructure but no utilitarian wheel: http://www.zoesaadia.com/real-smart-folks-but-no-wheel/ http://www.zoesaadia.com/real-smart-folks-but-no-wheel/.