; and (2) to formulate recommendations on how best to address the spills described in paragraph (1). (f) Inventory of offshore abandoned or sunken vessels Not later than 270 days after the date of enactment of this Act, the Under Secretary for Oceans and Atmosphere shall— (1) develop an inventory of offshore abandoned or sunken vessels in the exclusive economic zone (as established by Presidential Proclamation Numbered 5030 of March 10, 1983 ( 16 U.S.C. 1453 note))