; and (ii) is appropriate to maintain navigational safety. (H) Topple in place The term topple in place means detaching a structure from the seabed and toppling the structure onto its side on the seabed in the same area where the structure was originally attached. (2) Prohibition on removal (A) In general The Secretary of the Interior may not require a lessee, right-of-way holder, or owner of an idle structure to remove the idle structure until the date on which the Administrator submits a report under section 207(c)(4) of the National Fishing Enhancement Act of 1984 with respect to such idle structure. (B) Exception Subparagraph (A) does not apply with respect to an idle structure that the Secretary of the Interior determines poses a substantial threat to— (i) navigational safety; or (ii) the marine environment. (3) Suspension of removal If, during or as the result of an assessment conducted or determination approved under paragraph (1) or (2) of section 207(c) of the National Fishing Enhancement Act of 1984, respectively, the Administrator determines that there is an established reef ecosystem on, under, or in the immediate vicinity of an idle structure, the removal of the idle structure shall be suspended until the date on which the Secretary of the Interior, in consultation with the Administrator, determines whether— (A) the continued presence of the idle structure would benefit the marine environment on, under, or in the immediate vicinity of the idle structure as a habitat for fish, mollusks, or corals or other marine life; (B) the removal of the idle structure would harm— (i) the established reef ecosystem; or (ii) be otherwise detrimental to the biodiversity of the marine environment on, under, or in the immediate vicinity of the idle structure; (C) each oil and gas well associated with the idle structure has been temporarily abandoned through zonal isolation, permanently plugged and abandoned, or otherwise secured and each involved pipeline has been flushed of all hydrocarbons and filled with seawater