The port's security sent you and your mate against two underwater intruders. Training and a waterfront background, and knowing what your streamlined compact kit looks like to an arrestee, compared to sport scuba, keeps you to obeying orders as with your compact silent rebreathers you two easily overtake the suspects burdened with 3 big main air cylinders and 5 large pony cylinders each. You two push through a jungle of trailing unsecured air hoses and pressure gauge hoses and hold them by their vulnerable back-of-the-neck cylinder valves. They "dressing in drag" -- lots of it, the hydrodynamic variety -- does not let them resist even a quarter of effectively, or to turn quickly and they only can try to reach over their shoulders with the lobster hooks which they should not have had in their possession. You two pull them up away from the wreck into clear mid-water and up to your patrol boat, where they are de-kitted and identified and sent to the on-land law court system. Your clip-on-hemisphere mask lets you easily get your face free for a thankful drink of water, instead of having to take all your head kit off including your personal sonar's earpieces. Work goes on.