( ( Unlike ( ( other ( Deep ( Submergence Vehicles ) ) ) ( that ( use ( ( iron ballast ) ( to ( reach ( the ( ocean floor ) ) ) ) ) ) ) ) ) ( , ( ( the ( ( buoyancy and ) depth ) ) ( ( is ( adjusted ( by ( ballast tanks ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN Unlike) (NP (NP (JJ other) (NNP Deep) (NNP Submergence) (NNPS Vehicles)) (SBAR (WHNP (WDT that)) (S (VP (VBP use) (S (NP (NN iron) (NN ballast)) (VP (TO to) (VP (VB reach) (NP (DT the) (NN ocean) (NN floor)))))))))) (, ,) (NP (DT the) (NN buoyancy) (CC and) (NN depth)) (VP (VBZ is) (VP (VBN adjusted) (PP (IN by) (NP (JJ ballast) (NNS tanks))))) (. .)))
Unlike other Deep Submergence Vehicles that use iron ballast to reach the ocean floor, the buoyancy and depth is adjusted by ballast tanks.
(ROOT (S (NP (NNP Remote-control) (NNS vehicles)) (VP (VBP are) (ADJP (JJ able) (S (VP (TO to) (VP (VB go) (PP (TO to) (NP (DT the) (JJS deepest) (NN ocean) (NN floor)))))))) (. .)))