This is the dramatic moment crew battled wobbly seas to secure a tanker during a Single Point Mooring operation.

Footage captured by Tajrim shows the seafarers next to the T Sadberk crude oil tanker amid rough waters off the coast of Cilacap, Indonesia.

The small boat can be seen rocking with the movement of the sea on August 31.

Moments later, one of the crew managed to grab the rope attached to the massive ship, prompting them to manoeuvre away from the vessel while pulling along the cable.

Single Point Mooring is an offshore mooring system that allows large tankers to load or unload oil or other bulk liquids safely while remaining at sea.

The tanker connects to a buoy anchored to the seabed via a mooring line, which lets the ship rotate freely according to wind and waves. This system enables the safe transfer of cargo without requiring the ship to dock at a port, making it crucial for handling large vessels in deep or open waters.