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.