In megaman battle network 3 blue where is the 3rd secret place

The net area "Secret Area 3" is available only after beating Alpha. Go into the Undernet server and down the giant hole. Then, make your way through Secret Area 1 into Secret Area 2, and from there . . . I think you can figure it out. You will need to collect the hammer from Undernet 7 and defeat DarkMan and YamatoMan before you can reach Secret Area 3.