Mixtures of at least one nonionic surfactants and at least one ionic surfactant together with a gas create foams to aid the removal of produced hydrocarbon fluids from gas wells and pipelines. Within the environment, an entity moves about in furtherance of one or more tasks to be completed within the environment. A strip made of a bullet-proof material is arranged between the outer pane and the pane packet andor between at least two panes of the pane packet andor on the pane of the packet pointing toward the passenger area.