. ▁Specifically , ▁the ▁then ▁newly ▁discovered ▁structures ▁were ▁ ▁under ▁the ▁lake ▁surface , ▁but ▁the ▁historic ▁terra ces ▁were ▁expected ▁to ▁be ▁as ▁little ▁as ▁ ▁under , ▁and ▁" could ▁not ▁be ▁more ▁than ▁ ▁below ▁the ▁surface ". ▁Ke ir ▁spec ulated ▁that ▁the ▁structures ▁discovered ▁by ▁the ▁G NS ▁team ▁were ▁pre histor ic ▁terra ces , ▁never ▁before ▁seen ▁by ▁humans ; ▁or ▁perhaps ▁step - sh aped ▁objects ▁created ▁by ▁the ▁er u ption . ▁ ▁The ▁G NS ▁team ▁went ▁back ▁in ▁ 2 0 1 2 , ▁and ▁again ▁in ▁February ▁ 2 0 1 4 , ▁to ▁photograph ▁the ▁remains . ▁When ▁their ▁work ▁was ▁published ▁in ▁ 2 0 1 6 ▁in ▁the ▁Journal ▁of ▁Vol can ology ▁and ▁Ge oth erm al ▁Research , ▁they ▁drew ▁back ▁from ▁earlier ▁claims ▁and ▁reported ▁the ▁terra ces ▁were ▁likely ▁destroyed . ▁In ▁ 2 0 1 7 ▁an ▁article ▁by ▁Bill ▁Ke ir ▁in ▁the ▁Journal ▁of ▁the ▁Royal ▁Society ▁of ▁New ▁Zealand ▁stated ▁that ▁the ▁terra ces ▁could ▁not ▁have ▁surv ived ▁int act . ▁ ▁In ▁ 2 0 1 0 , ▁S as cha ▁N old en ▁discovered ▁Hoch st etter ' s ▁archive ▁in ▁Bas el , ▁Switzerland , ▁and ▁began ▁progress ively ▁catalog ing ▁and ▁publishing ▁it . ▁The ▁archive ▁includes ▁Hoch st etter ' s ▁field ▁di aries ▁which ▁contain ▁the ▁raw ▁data ▁from ▁his ▁comp ass ▁survey ▁of ▁Lake ▁Rot om ah ana ▁and ▁the ▁P