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The Nyon Agreement, 14 September 1937.
V. The participating Powers agree that, in order to simplify the operation of the above-mentioned measures, they will for their part restrict the use of their submarines in the Mediterranean in the following manner:
(a) Except as stated in (b) and (c) below, no submarine will be sent to sea within the
(b) Submarines may proceed on passage after notification to the other participating Powers, provided that they proceed on the surface and are accompanied by a surface ship.
(c) Each participating Power reserves for purposes of exercises certain areas defined in Annex I hereto in which its submarines are exempt from the restrictions mentioned in (a) or (b).
The participating Powers further undertake not to allow the presence in their respective territorial waters of any foreign submarines except in case of urgent distress, or where the conditions prescribed in sub-paragraph (b) above are fulfilled.