As much as he hated to admit it, Shark wasn't someone who could get into Blue Ember without looking suspicious. Being an overweight giant made it impossible for him to lie low, and with half of his diving equipment installed directly into his body, there is simply no way for him to get through the security checks unnoticed. That's where the other members of the heist crew come in.
The chick with purple hair and the guy who likes suits were scheduled to enter the hotel sometime that evening. Once inside, they will connect their NIMs to the local network to access some of the features of the hotel. That would cause a hidden file to be sucked into it like a spec of dust falling into a whirlpool.
The file itself couldn't be very large or complex, which is why they can't just dive into the network from an inside connection, despite it appearing as the more logical choice. It only served as a beacon to guide the real diver who had a way to track it through the data ocean.
