( ( The ( photic zone ) ) ( ( ( extends ( to ( ( a ( maximum depth ) ) ( of ( ( 200 meters ) ( -LRB- ( ( 656 feet ) -RRB- ) ) ) ) ) ) ) ( below ( ( the surface ) ( of ( the water ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ photic) (NN zone)) (VP (VBZ extends) (PP (TO to) (NP (NP (DT a) (JJ maximum) (NN depth)) (PP (IN of) (NP (NP (CD 200) (NNS meters)) (PRN (-LRB- -LRB-) (NP (CD 656) (NNS feet)) (-RRB- -RRB-)))))) (PP (IN below) (NP (NP (DT the) (NN surface)) (PP (IN of) (NP (DT the) (NN water)))))) (. .)))
The photic zone extends to a maximum depth of 200 meters (656 feet) below the surface of the  water.
(ROOT (S (NP (DT The) (JJ photic) (NN zone)) (VP (VBZ extends) (ADJP (NP (CD 200) (NNS meters)) (JJ deep))) (. .)))
The photic zone extends 200 meters deep.