Which of the following is a drilling hazard specific to offshore drilling?

Seasickness is a distinctive hazard associated with offshore drilling, as it pertains to the effects of being on the water. Offshore drilling operations frequently occur in turbulent seas, which can lead to motion sickness among crew members. The swaying and rolling of the drilling platform can cause discomfort and affect the crew's ability to perform their tasks effectively. This environmental factor is not an issue in land drilling where stability is not compromised by water conditions.

While the other options present real concerns during drilling operations, they are not exclusive to offshore environments. Rock fragmentation, overheating of the drill bit, and insufficient drilling fluid can all occur in both onshore and offshore drilling contexts. Thus, seasickness stands out as the most relevant hazard specific to the offshore drilling setting.