XT-007 entered The building where Nick Fury was, completely undetected and in stealth mode Invisible to the naked eye. He had been tracking him for awhile now, but was always too late, as Fury shifted from base to base.
Interacting with the area's computer systems to keep the alarms in check.
Clinging to the ceiling, XT-007 moved down the hallways, searching the rooms, attempting to locate Fury...
He entered the room where most of the team were hanging out, quickly moving above them perfectly silent and un-noticed. He moved passed Spider man (Most likely setting off Spidey Senses) and entered the next area... He jumped to the ground and accessed a nearby camera Terminal, using it to look all around the base. (Still Cloaked)
(Fury's systems were probably starting to detect a disturbance now)