108 fig9 and 10 the bladder is also completed by a small number of connectors 9 arranged on the upper surface of compartments 3 neighboring the ends of the bladder the total mass of such a bladder and its two cables is in the vicinity of 135 tons to store the bladder and place it on standby the two side strings 213 thereof are folded on the middle string 2 a fig7 and 8 and are maintained by frangible connections 11 fig8 thus the two cables 8 are visible on each side the assembly is then wound on a drum 12 fig6 fig9 to 11 illustrate the placement of the bladder 1 on a sea bottom 13 at a great depth typically 1 000 m or more the drum 12 supporting the bladder 1 is placed onboard a towboat 14 or another easily available vessel the onboard mass is in the vicinity of 170 tons which makes it possible to load it with handling means commonly available in an oil port a mooring 15 is arranged at a suitable location on the bottom 13 said mooring being connected to one end of two parallel initiation cables 16 each provided with connecting tip 116 the bladder 1 is lowered under the effect of its own weight to the mooring 15 and each of its cables 8 is connected to the free end of the corresponding cable 16 by a rov remote operated vehicle using the tips 108 and 116 then fig1 and 12 side moorings 17 are arranged on either side of.