A portion of most Oceanographers' duties are carried out in an office-type setting, conducting research, writing proposals, or publishing findings in journals. Not a ton of danger here, except paper cuts.
However, the other aspects of the job might pose some physical danger. Laboratory work can expose Oceanographers to harsh chemicals, heat, or sharp instruments. Field work can be the most dangerous of all. Being on the open ocean for any length of time is an unpredictable scenario, and Oceanographers need to be prepared for the unforeseen events which can take place at sea: rogue waves, sinking ships, hurricanes, and shark-infested waters.
Luckily, scurvy is a thing of the past.