Why does hades tell the other gods about the missing helm of darkness

Hades does not believe that the other gods will help him search for the Helm of Darkness, so he doesn't tell any of the other guards that it is missing. Eventually, Percy helps him find the Helm of Darkness that was stolen by Luke, so Hades helps Percy out and returns his mother. 

“the globe theatre is housed in an open arena the layout of the open air arena, featured the ‘ pit’ or the ‘yard’. the globe had a raised stage at one end and was surrounded by three tires of roofed galleries with balconies overlooking the back of the stage. the stage projected halfway into the ‘pit’”. i hope this information you .