Plate Facing page 



XVI The TrzWe off Ponza, 29th September 1953 . .114 



XVII Before the dive off Ponza, Salvio cleans the large 

 window of the antechamber. Note the door on the 

 left, and (above) the magnetic ballast valve . -115 



XVIII Checking the unballasting device . . . -115 

 XIX Professor Piccard at the top of the lock . . .130 



XX Inside the cabin. Jacques Piccard checks the Draeger 



apparatus for purifying the air . . . .130 



XXI The Trieste breaks surface after diving to 1732 fathoms 131 



XXII Returning to Castellammare after the last dive . -131 



[x] 



