▁season . ▁During ▁the ▁series ' ▁ele vent h ▁season , ▁Gr iss om ▁begins ▁consult ing ▁for ▁the ▁Per uv ian ▁government ▁on ▁the ▁et ym ology ▁and ▁physical ity ▁of ▁the ▁In ca . ▁It ▁is ▁during ▁this ▁time ▁that ▁S ara ▁and ▁Gr iss om ▁divor ce , ▁cit ing ▁ge ographical ▁differences . ▁He ▁later ▁joins ▁a ▁group ▁dedicated ▁to ▁protect ing ▁fish ▁and ▁wild life ▁in ▁the ▁Pacific , ▁a ▁role ▁described ▁as ▁a ▁" C SI ▁at ▁sea ." ▁After ▁his ▁activities ▁lead ▁him ▁to ▁the ▁Port ▁of ▁San ▁Diego , ▁Gr iss om ▁reun ites ▁with ▁Will ows ▁and ▁the ▁C SI ▁team ▁in ▁order ▁to ▁consult ▁on ▁a ▁series ▁of ▁bomb ings ▁in ▁Las ▁Veg as . ▁During ▁this ▁case , ▁he ▁recon c iles ▁with ▁Sid le , ▁and ▁the ▁two ▁sail ▁off ▁together ▁in ▁order ▁to ▁continue ▁his ▁work ▁as ▁a ▁wild life ▁advoc ate . ▁ ▁Character ization ▁ ▁Person ality ▁Early ▁episodes ▁revealed ▁Gr iss om ▁to ▁be ▁a ▁w itt y , ▁enthus i astic , ▁and ▁qu ir ky ▁scient ist ▁who ▁had ▁some ▁sense ▁of ▁humor . ▁He ▁fl irt ed ▁regularly ▁and ▁seemed ▁to ▁be ▁constantly ▁in ▁a ▁hyper active ▁state . ▁ ▁However , ▁when ▁he ▁began ▁to ▁lose ▁his ▁hearing , ▁Gr iss om ▁retre ated ▁into ▁himself ▁and ▁became ▁easily ▁ir rit ated ▁and ▁un appro ach able . ▁ ▁After ▁his ▁surg ery , ▁he ▁light ened ▁up ▁a ▁bit , ▁but ▁never