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“(a) ‘Secretary’ means, except where its usage indi- 
cates otherwise, the Secretary of the Interior ; 
““(b) ‘deep seabed’ means the seabed, and the sub- 
soil thereof, lying seaward and outside the continental 
shelf of any nation; 
“(ce) “continental shelf’ refers to the seabed and sub- 
soil of the submarine areas adjacent to the coast of any 
nation (including the coasts of islands) , but outside the 
area of the territorial sea, to a depth of two hundred meters 
or, beyond that limit, to where the depth of the superjacent 
waters admits of the exploitation of the natural resources 
of the said areas; 
“(d) ‘block’ means an area of the deep seabed having 
four boundary lines which are lines of longitude and lati- 
tude, the width of which may not be less than one-sixth 
the length, comprising not more than forty thousand 
square kilometers, and extending downward from the 
seabed to a depth of ten meters; 
““(e) ‘hard mineral’ or ‘hard mineral resources’ re- 
fers to nodules or accretions containing, but not limited 
to, iron, manganese, nickel, cobalt, and copper; 
“(f) ‘development’ means any operation of explora- 
tion and commercial recovery, other than prospecting, 
having the purpose of discovery, recovery, or delivery of 
hard minerals from the deep seabed ; 
