How did los topos group get its name

Their name was coined by the press and calles them moles (since they spend time underground)

There was also a theather group named after them

Los Topos means "the moles".  They got their name because they go under the collapsed buildings and pull out the people who are trapped underneath and can't escape.  

Yes it is correct like that is there anything else you need to add ?

Your answer is correct