code: def _apply_snap_off(self, queue=None):
          r
          net = self.project.network
          phase = self.project.find_phase(self)
          snap_off = self.settings['snap_off']
          if queue is None:
              queue = self.queue[0]
          try:
              Pc_snap_off = phase[snap_off]
              logger.info("Adding snap off pressures to queue")
              for T in net.throats():
                  if not np.isnan(Pc_snap_off[T]):
                      hq.heappush(queue, [Pc_snap_off[T], T, 'throat'])
          except KeyError:
              logger.warning("Phase " + phase.name + " doesn't have " +
                             "property " + snap_off)
docs: r"""
          Add all the throats to the queue with snap off pressure
          This is probably wrong!!!! Each one needs to start a new cluster.