Water worlds intrigue me. All the elements and heat vents you might need for life. But how do you develop the technology for an escape velocity civilization in

Water worlds intrigue me. All the elements and heat vents you might need for life. But how do you develop the technology for an escape velocity civilization in a medium so corrosive and viscous? Super Earths are a likely source of water worlds, since the same percentage of water volume (~ to radius^3) results in much deeper oceans at the surface (~ to radius^2). The greater gravity would create even more hurdles. How do you hit escape velocity if your fuel to orbit is to heavy to lift itself? First orbital vehicle might have to be nuclear. Problem 1: Develop a civilization with a sustained technology runway in a medium that corrodes, relentlessly saps temperature gradients, creates immense pressure at its solid floor, etc. Problem 2: Create floating platforms and colonize their ocean surface. Problem 3: Develop atmospheric flight, from their bobbing surface colonies, with heavy water filled planes. Problem 4: Develop orbital flight with water filled space craft. Problem 5: Develop sustainable water filled living environments off planet, as first step to going beyond. And do this before their star or other cause finishes them off!