we have a partnership as a security consulting and engineering firm with firms like thomas setey who is with blast design and the premiere of blast designs and they have worked with the pentagon and worked with the coals, and what we did was asked the executive director to allow to us bring in best of class people to say, you know, we have this explosive event threat that's been identified by urs, we have thomas seteyb one of the premier engineers in the world. let's look at possible damage. we like to compete with each other and bring different viewpoints to the subjects because that's our responsibility. >> bob, can i, just top to be helpful with time can you go over the budgetary recommendations. we can go through all the dooms day scenarios. but we are more interested in the fs fiscal lens of this. >> we've had a series of threats, from a budget perspective. there are relatively and were relatively minor structural enhancement required because the building was extra ordinarily robust. as the building begins to move, the structural design of the building had to take into considera