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vertically below lying seaward and outside the Conti- 
nental Shelf of the United States and the Continental 
Shelves of foreign states, as defined i in 1 the 1958 Conven- 
tion on the Continental Shelf; 
(c) “block”? means an area of the deep seabed havy- 
ing four boundary lines which are lines of longitude and 
latitude, the width of which may not be less than one- 
_sixth the length and shall include either of two types of 
blocks: (i) “surface blocks” comprising not more than 
forty thousand square kilometers and extending down- 
ward from the seabed surface to a depth of ten meters; 
(11) “subsurface blocks” comprising not more than five 
hundred square kilometers and extending from ten — 
“meters below the seabed surface downward without 
limitation; — 
(4) “hard mineral” means any mineral, ‘metallif 
erous mud, or other nonliving substance other than oil, 
gas, hydrocarbons, and any other substance which both 
naturally occurs and is normally recovered in liquid or 
gaseous form; 
(ec) “development” means any operation of ex- 
-ploration and exploitation, other than prospecting, hav- 
ing the purpose of discovery, recovery, or delivery of 
hard minerals from the deep seabed; 
(f) “prospecting” means any operation conducted 
