Setting
The secret, hidden base of the Red Society assassins. All assassins need a place to rest without worry of their enemies getting revenge. And in the publics eye is no safe lace. So Viktor has went through extraordinary lengths to make sure his team can get a goodnight rest. Here they have access to just about whatever they need: exercise equipment, weapon room, shooting range, training room, bathroom, bedroom, kitchen etc. They even have a great security system besides their own bodies.
The base is located below at the bottom of Low New York Bay, 20 feet underground. It has only one way in and one way out, except emergency escape pods. This base would made possible with the help of genius team of engineers and architects, who are all now dead. Viktor couldn't anyone outside of Red Society knowing of the base location.