Environment Control (Onshore or Offshore). Environment Control (Onshore or Offshore). At work sites, it is imperative that the respective environments are maintained meticulously, and TFES’s stringent processes ensure the effectiveness of this task. Onshore and Offshore Epidemic Prevention and Control and Boroscoping Disinfection and Decontamination Fungal Remediation Explore Our Business Short-term Offshore Management Learn More. Planning & Design Learn More. Application & Matching Learn More.