The Jacuzzi job is one of the hardest missions if you have no good idea how to do it unseen, but it is possible. This time, watching the video might be a better choice than these descriptions. There are three options: After the hit run to the elevator and wait for the technician to arrive. When he does, go into the elevator and leave the penthouse. It is possible to sedate the technician as well if needed, but he sees rather well in darkness and apparently has telepathic abilities to alarm the guards instantly when startled so this is difficult and not recommended.