Getting out of the well is defiantly a problem. In orbit power can be solved via solar boilers and the ship would look like one of those WWI deathtraps they called submarines. It would take a thruster plate technology to lift the vehicle. Perhaps some alien tech falls to the planet a genius deciphers how it woks and is able to build a “one shot” plate that can cancel out 98% of its weight. At that point perhaps a few massive TL-4 SRBs could lift the vessel into orbit.