His down you went taunt is brilliant . <| sep |> No contingency needed . They will lose and continue to prove themselves to be intolerant disruptive idiots . <| sep |> We have done so much for signal quality in the past 25 years . In the 90 s , turbo codes were developed , and were integral to both 802 . 11 G wireless router protocol and 3 G mobile phone . These codes make communication so much more reliable , it is really insane . To suplement this , in the 2000 s we started working on which really strengthened cell phone signals and also lead to 802 . 11 N routers . But . in forms of communication , urban environments , especially indoors and tunnels will create major problems . There are two major factors , first signal attenuation and second multipath fading . Also , the error correction on most all digital communications has a waterfall effect . That is , there is a very narrow region between near 0 error , and total catastrophe . This is the price of operating near the channel capacity . In fact this principle is born out by the mathematics , where trying to operate at rates above the channel capacity lead to rerror rates converging exponentially to 1 , wrt block size . When going underground , the signal now has to pair through layers and layers of ground , which is denser than air . This horribly attenuates the signal , especially at the higher frequencies we use for communication . The only way we could really penetrate that medium would be extremely high power output or lower frequency . This is not directly tied to our technology really , although use of MIMO attenas does really help . Multi path is a large problem indoors , where multiple surfaces tend to reflect the signal . The receiver ends up getting multiple , slightly delayed , copies of itself . It can wreak havoc . To deal with this we generally perform some channel conditioning , but honestly it can still be a problem . Furthermore small shifts in position can lead to large changes in the signal , because of the high frequency in the communication signal . Think about it like this , if something at 1 hz gets delayed by 12 second , it is now completely out of phase with the original signal . If a 10 hz signal is delayed by 120 of a second it will be completely out of phase with the original signal . If we are at 2 . 4 gHz , a small delay leads to a large phase shift . These effects can be particularly destructive , but MIMO really shines hear . With multiple antennas you can help eliminate this with some post processing . Still , these effects are quite destructive , and it is generally just best to move to the center of the room and away from obstacles which reflect electromagnetic waves . So to conclude , yes we have made great strides in communications . But what you are looking at are the two hardest practical problems for physical layer communications to deal with . We probably will never have perfect solutions to either of these problems .