It is the sense of Congress that research and limited exploration activities concerning the R.M.S. Titanic should continue for the purpose of enhancing public knowledge of its scientific, cultural, and historical significance: Provided, That, pending adoption of the international agreement described in section 450rr–4(a) of this title or implementation of the international guidelines described in section 450rr–3 of this title, no person should conduct any such research or exploration activity which would physically alter, disturb, or salvage the R.M.S. Titanic.