sch witz ▁canal , ▁a . o . ▁From ▁ 1 9 1 0 ▁till ▁ 1 9 1 3 ▁A ck erm ans ▁& ▁van ▁H aar en ▁built ▁a ▁ 1 1 5 0   m ▁long ▁tunnel ▁in ▁Buenos ▁Aires , ▁supp lying ▁water ▁from ▁the ▁Rio ▁de ▁la ▁Pl ata . ▁Other ▁Latin ▁American ▁countries ▁where ▁A ck erm ans ▁& ▁van ▁H aar en ▁was ▁active ▁before ▁the ▁First ▁World ▁War ▁include ▁Uruguay , ▁where ▁the ▁company ▁built ▁the ▁port ▁of ▁Monte video ▁and ▁carried ▁out ▁gra vel ▁d red ging ▁near ▁Col ón , ▁and ▁Brazil ▁where ▁ 8 . 5 ▁million   m 3 ▁were ▁d red ged ▁in ▁the ▁port ▁of ▁Rio ▁Grande ▁do ▁Sul ▁between ▁ 1 9 0 8 ▁and ▁ 1 9 1 6 .) ▁ ▁In ▁the ▁Russian ▁town ▁of ▁Saint ▁Petersburg ▁A ck erm ans ▁& ▁van ▁H aar en ▁built ▁the ▁military ▁har bour , ▁known ▁as ▁Emperor ▁Peter ▁the ▁Great , ▁between ▁ 1 9 1 3 ▁and ▁ 1 9 1 7 . ▁In ▁ 1 9 1 6 ▁the ▁company ▁started ▁construction ▁of ▁do cks ▁for ▁the ▁Russian ▁n avy ▁at ▁S ve ab org ▁near ▁Hels ing f ors , ▁currently ▁named ▁Hels ink i , ▁the ▁capital ▁of ▁Finland . ▁In ▁the ▁Inter bell um ▁DE ME - comp an ies ▁built ▁the ▁new ▁Balt ic ▁port ▁of ▁G d yn ia ▁for ▁which ▁a ▁total ▁of ▁ 3 6 ▁million   m 3