The project plan and the target of the development work carried out between the three design teams have been:
 
  HDW Submarine Class 214

Creation of a technical solution to make individual escapes from submarines possible from any depth

Reduction of gas consumption per escapee to an absolute minimum in order to maximise the number of escapees, using a given gas reservoir

No energy source other than compressed gas

No electronically or hydraulically driven compo-nents

bfa SPES ascending
  Maximum buoyancy guaranteed in the escape device, when compression is complete, to minimise the time used for the ascent to the surface

Reduction of the time used for flooding and compressing the air lock to an absolute minimum, which can be endured by the escapee