Manhole opened and not correctly closed

  • Safety Flash
  • Published on 6 July 2020
  • Generated on 27 July 2026
  • IMCA SF 20/20
  • 1 minute read

What happened?

During a safety round on deck prior to cargo operations it was noticed that a manhole had been opened in order to pump out ballast water to replace a faulty valve.

During a safety round on deck prior to cargo operations it was noticed that a manhole had been opened in order to pump out ballast water to replace a faulty valve.

What went wrong?

The manhole cover or hatch nuts had been completely removed and the cover was only placed back on top and was left completely unsecured.

There was no barrier tape nor any warnings placed to indicate that the cover was open and unsecured.

Bypassing safety controls:

  • Crew did not follow company procedures.
  • No warnings were posted.
  • It did not occur to the crew doing this work to consider the potential risks of persons falling inside or slipping from standing on the manhole cover while so placed and not secure.

Latest Safety Flashes:

MAIB: Catastrophic engine failure and subsequent fire

MAIB has published Accident Investigation Report 10/2026 into a catastrophic failure of a diesel generator engine on board the vessel Kommandor Susan.

Read more
BSEE: Compressed gas cylinder hazards

BSEE has published Safety Alert 516, relating to potential risks involving compressed gas cylinders.

Read more
MSF: dropped object inside vessel tank

MSF have published Safety Alert 26-05 relating to a tank cleaning machine coming lose and falling within a tank on a vessel.

Read more
Uncontrolled movement of cargo

During offshore cargo operations alongside a rig, a single pipe loaded on deck shifted due to vessel motion and swell conditions.

Read more
Positives – rubber seals on hatches, securing of shackle pins, fuel sample box

A Member reports a few positive findings.

Read more

IMCA Safety Flashes summarise key safety matters and incidents, allowing lessons to be more easily learnt for the benefit of the entire offshore industry.

The effectiveness of the IMCA Safety Flash system depends on the industry sharing information and so avoiding repeat incidents. Incidents are classified according to IOGP's Life Saving Rules.

All information is anonymised or sanitised, as appropriate, and warnings for graphic content included where possible.

IMCA makes every effort to ensure both the accuracy and reliability of the information shared, but is not be liable for any guidance and/or recommendation and/or statement herein contained.

The information contained in this document does not fulfil or replace any individual's or Member's legal, regulatory or other duties or obligations in respect of their operations. Individuals and Members remain solely responsible for the safe, lawful and proper conduct of their operations.

Share your safety incidents with IMCA online. Sign-up to receive Safety Flashes straight to your email.