Help me remember (Fallout 4)

I remember buying a pirate fallout 3 disc with all the dls, a couple of mods and so on. There, in the upper corner of the map, there was a cave at the entrance to which we were transferred to another map. At the exit from the cave stood the robot Ilyich and a couple of soldiers in red power armor, then there was a metal building in which there were soldiers in the power armor of the enclave from part 2. Perhaps this is a DLS, perhaps an amateur quest, the fact is that hell remember the name.