87 
(f) an annual statistical report, in a form standardised by the Organiza- 
tion, of penalties actually imposed for infringement of the present Conven- 
tion. 
(2) The Organization shall notify Parties of the receipt of any communications 
under the present Article and circulate to all Parties any information commu- 
nicated to it under sub-paragraphs (1) (b) to (f) of the present Article. 
Article 12 
CASUALTIES TO SHIPS 
(1) Each Administration undertakes to conduct an investigation of any cas- 
ualty occurring to any of its ships subject to the provisions of the Regulations if 
such casualty has produced a major deleterious effect upon the marine environ- 
ment. 
(2) Each Party to the Convention undertakes to supply the Organiaztion with 
information concerning the findings of such investigation, when its judges that 
such information may assist in determining what changes in the present Con- 
vention might be desirable. 
Article 13 
SIGNATURE, RATIFICATION, ACCEPTANCE, APPROVAL AND ACCESSION 
(1) The present Convention shall remain open for signature at the Headquar- 
ters of the Organization from 15 January 1974 until 31 December 1974 and shall 
thereafter remain open for accession. States may become Parties to the present 
Convention by: 
(a) signature without reservation as to ratification, acceptance or ap- 
proval; or 
(b) signature subject to ratification, acceptance or approval, followed by 
ratification, acceptance or approval; or 
(ec) accession. 
(2) Ratification, acceptance, approval or accession shall be effected by the 
deposit of an instrument to that effect with the Secretary-General of the Or- 
ganization. 
(3) The Secretary-General of the Organization shall inform all States which 
have signed the present Convention or acceded to it of any signature or of the 
deposit of any new instrument of ratification, acceptance, approval or acces- 
sion and the date of its deposit. 
Article 14 
OPTIONAL ANNEXES 
(1) A State may at the time of signing, ratifying, accepting, approving or 
acceding to the present Convention declare that it does not accept any one or all 
of Annexes III, IV and V (hereinafter refered to as “Optional Annexes”) of the 
present Convention. Subject to the above, Parties to the Convention shall be 
bound by any Annex initsentirety. - 
(2) A State which has declared that it is not bound by an Optional Annex may 
at any time accept such Annex by depositing with the Organization an instru- 
ment of the kind referred to in Article 13(2). 
(3) A State which makes a declaration under paragraph (1) of the present 
Article in respect of an Optional Annex and which has not subsequently accepted 
that Annex in accordance with paragraph (2) of the present Article shall not 
be under any obligation nor entitled to claim any privileges under the present 
Convention in respect of matters related to such Annex and all references to 
Parties in the present Convention shall not include that State in so far as matters 
related to such Annex are concerned. 
(4) The Organization shall inform the States which have signed or acceded 
to the present Convention of any declaration under the present Article as well as 
the receipt of any instrument deposited in accordance with the provisions of 
paragraph (2) of the present Article. 
Articie 15 
ENTRY INTO FORCE 
- (1) The present Convention shall enter into force twelve months after the 
date on which not less than 15 States, the combined merchant fleets of which 
