Also another development that would come earlier (if at all) would be satellites. Could the civilistaion somehow manage to build, launch, and operate satellites? There are three main points to this, as the question states:
Build: Given that the civilisation has managed to build tools and computers, it should be pretty straight forward to actually build the satellite. (Correct me if I'm wrong)
Launch: Since the civilisation is an underwater one, how, if in any way, would they launch the satellite into space?
- Operate: This is the most basic question, since they wouldn't build the satellite if they can't use it/don't need it. Could they somehow find a way to transmit signals deep underwater? (If it isn't already possible)
(Tell me if I've missed something else that should have been there.)
Also, regardless of whether they need/don't need satellites, could they build and operate a spaceship? I think the same points given above should apply to this, except one addition being how would they control/run the spaceship once they are inside, since they have to be in water all the time?
The species doesn't necessarily have a definite physical configuration (hands, legs, etc) so don't let that limit your answers, however, do mention any special requirements.