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a diameter of one thousand two hundred and fifty 
kilometers. 
(b) No license shall be issued or transferred under this 
Act, and no person subject to the jurisdiction of the United 
States shall have a substantial interest in a license issued 
under this Act, which would result in any person directly or 
indirectly holding, controlling, or having a substantial interest 
in licenses for development of any portion of the deep sea- 
bed which that person could not hold directly under this Act 
in accordance with the limitations of this section. | 
RELINQUISHMENT OF LICENSED AREAS 
Src. 11. Within fifteen years of the license date for 
any block, and not later than the grant of authorization to 
exploit as provided for in section 9 hereof, the licensee shall, 
by written notice to the Secretary, relinquish 75 per centum 
of such block measured laterally. The relinquishment shall be 
such that the unrelinquished area or areas shall conform 
to the shape of a block as defined in section 3 hereof. The 
licensee shall select the area of the block to be relinquished 
and as many as four contiguous blocks of the same type held 
by the licensee may be treated as a single unit for selecting 
the area to be relinquished. 
INTERNATIONAL REGIME 
Src. 12. At such time as an international agreement, 
providing for the establishment of an international regime 
