ok ut y ae v ▁after ▁the ▁launch . ▁Rep lying ▁back ▁the ▁Moscow ▁Mission ▁Control ▁said ▁" This ▁is ▁a ▁great ▁anni versary ▁flight , ▁and ▁have ▁a ▁great ▁one ". ▁ ▁D ock ing ▁ ▁The ▁So y uz ▁T MA - 2 1 ▁space craft ▁dock ed ▁with ▁the ▁International ▁Space ▁Station ▁( I SS ) ▁on ▁April ▁ 6 ▁at ▁ 2 3 : 0 9 ▁UTC . ▁The ▁dock ing ▁to ▁the ▁Po isk ▁module ▁occurred ▁as ▁the ▁two ▁space craft ▁were ▁orbit ing ▁over ▁the ▁And es ▁Mountains ▁in ▁Chile . ▁H atch es ▁between ▁the ▁So y uz ▁T MA - 2 1 ▁and ▁the ▁I SS ▁were ▁opened ▁at ▁ 2 : 1 3 ▁UTC ▁on ▁April ▁ 7 . ▁The ▁three ▁So y uz ▁crew ▁members ▁flo ated ▁into ▁the ▁I SS . ▁They ▁were ▁wel com ed ▁ab o ard ▁for ▁a ▁crew ▁gre eting ▁ceremony ▁and ▁a ▁mand atory ▁safety ▁orientation ▁by ▁Ex ped ition ▁ 2 7 ▁Commander ▁D mit ry ▁K ond rat ye v ▁and ▁Fl ight ▁Engine ers ▁Catherine ▁Cole man ▁and ▁Paolo ▁N es pol i . ▁ ▁Return ▁to ▁Earth ▁ ▁The ▁So y uz ▁T MA - 2 1 ▁crew ▁had ▁been ▁due ▁to ▁come ▁back ▁on ▁September ▁ 8 ▁but ▁its ▁return ▁was ▁delayed ▁due ▁to ▁the ▁crash ▁of ▁the ▁Progress ▁M - 1 2 M ▁on ▁August ▁ 2 4 . ▁ ▁The ▁So y uz ▁T MA - 2 1 ▁space craft