Unless otherwise stated, this subchapter applies to OCS facilities, vessels, and other units engaged in OCS activities as the term ``OCS activities'' is defined in Sec. 140.10. This subchapter does not apply to pipelines and deepwater ports (as the term ``deepwater port'' is defined in section 3(10) of the Deepwater Port Act of 1974 (33 U.S.C. 1502)).