▁Human ▁ske let ons ▁were ▁not ▁found ▁during ▁the ▁exc av ation , ▁because ▁they ▁decom posed ▁without ▁bur ial ▁sites . ▁During ▁renov ation ▁of ▁the ▁commercial ▁building ▁of ▁the ▁Swiss ▁National ▁Bank ▁at ▁Se ef eld str asse ▁in ▁ 2 0 1 1 , ▁the ▁department ▁of ▁under water ▁arch ae ology ▁recovered ▁sh ards ▁of ▁pot tery ▁vessels , ▁stone ▁and ▁b one ▁tools , ▁a ▁pendant ▁made ▁of ▁ant lers ▁and ▁animal ▁b ones , ▁as ▁well ▁as ▁some ▁ ▁p iles ▁of ▁the ▁st ilt ▁houses , ▁that ▁d end ro chron ology ▁dated ▁to ▁ 3 6 8 4 ▁BC . ▁ ▁Prote ction ▁ ▁As ▁well ▁as ▁being ▁part ▁of ▁the ▁ 5 6 ▁Swiss ▁sites ▁of ▁the ▁UN ES CO ▁World ▁Heritage ▁Site ▁Pre histor ic ▁p ile ▁dwell ings ▁around ▁the ▁Al ps , ▁the ▁settlement ▁is ▁also ▁listed ▁in ▁the ▁Swiss ▁invent ory ▁of ▁cultural ▁property ▁of ▁national ▁and ▁regional ▁significance ▁as ▁a ▁Class ▁A ▁object ▁of ▁national ▁importance . ▁Hence , ▁the ▁area ▁is ▁provided ▁as ▁a ▁historical ▁site ▁under ▁federal ▁protection , ▁within ▁the ▁meaning ▁of ▁the ▁Swiss ▁Federal ▁Act ▁on ▁the ▁nature ▁and ▁cultural ▁her itage ▁( G erman : ▁Bundes ges etz ▁über ▁den ▁Natur - ▁und ▁Heimat schutz ▁N H G ) ▁of ▁ 1 ▁July ▁ 1 9 6 6 . ▁Un author ised ▁research ing ▁and ▁purpose ful ▁gather ing ▁of ▁find ings ▁represent ▁a ▁criminal ▁off ense ▁according ▁to ▁Art . ▁ 2 4