The Shelter was dealing with more trouble than they could handle. It was chaos inside, but most of the citizens had managed to go to the underground emergency locations in the Shelter. They were built in case anything like this did occur.
There was also a teleporter in these locations, but today they did not work, and they just had to hope that the glathrium metal bunkers they were in, would hold. The Shelter just wasn't that well equipped to deal with this type of attack.
Even though only five black pods had landed in the Shelter, the Dalki that had emerged from them were stronger than they had expected. Two of them were one spiked Dalki. The military personnel, including the Travelers, were fighting against them.