▁ 2 0 1 9 ▁that ▁it ▁had ▁alter ed ▁the ▁proposed ▁design ▁of ▁Th ane ▁station ▁which ▁would ▁save ▁ 2 1 , 0 0 0 ▁mang ro ve ▁trees . ▁As ▁a ▁result , ▁only ▁ 3 2 , 0 4 4 ▁mang ro ves ▁are ▁affected ▁by ▁the ▁project . ▁ ▁Land ▁ac quisition ▁Survey ▁work ▁on ▁the ▁route ▁began ▁in ▁January ▁ 2 0 1 7 . ▁According ▁to ▁N HS RC ▁director ▁M uk ul ▁Sar an ▁Math ur , ▁" The ▁ge o - techn ical ▁surve ys ▁have ▁started ▁along ▁the ▁entire ▁route ▁between ▁M umb ai ▁and ▁Ah med abad ▁and ▁is ▁expected ▁to ▁take ▁two ▁to ▁three ▁months . ▁The ▁activities ▁that ▁have ▁begun ▁include ▁ge o - techn ical ▁and ▁ge o - phys ical ▁investig ations ▁into ▁the ▁ 2 1 - kil omet re , ▁under - water ▁tunnel ▁of ▁the ▁project ▁as ▁well ▁as ▁the ▁Final ▁Location ▁Survey ▁to ▁mark ▁the ▁alignment , ▁right ▁down ▁to ▁the ▁pill ars ▁on ▁which ▁the ▁high ▁speed ▁trains ▁will ▁run ." ▁R IT ES ▁identified ▁ 7 5 0 ▁locations ▁along ▁the ▁entire ▁route ▁to ▁carry ▁out ▁soil ▁testing , ▁including ▁ 6 2 ▁locations ▁for ▁the ▁under ground ▁section . ▁The ▁ag ency ▁completed ▁soil ▁testing ▁at ▁a ▁total ▁of ▁ 2 5 0 ▁locations ▁by ▁ 2 4 ▁February . ▁Official s ▁carried ▁out ▁testing ▁of ▁soil ▁and ▁rocks ▁at ▁a ▁depth ▁of ▁ 7 0 ▁metres ▁under water ▁for ▁the