Fi^. 11. Alexander the Great in his diving bell 



2,500 feet. No bottom was reached. From this negative 

 result the great seafarer, rather rashly, concluded that 

 he had chanced upon the greatest of all ocean depths. 

 Modern soundings have proved the depth in the vicinity 

 to be about 15,000 feet or six times the length of the 

 composite sounding line. However, on this slender 



