Thank you for clarifying the game and world involved. I've moved this to a different sub-forum section.
When a base is killed a ruin appears. After a set time the ruin disappears. Also, if another player lands on the ruin then moves off, the ruin is no longer there.
When a base is killed, the player sees the ruin slightly differently and can move the base. It then gets a dome of protection to prevent other players from killing it immediately. During this time repairs can be completed. Automatically for the defence and at a cost for the main base buildings. It is often better to wait for a time (depending on the level of the base and the level of the construction yard) to build up base repair time while a ruin rather than immediately respawning with the dome.
