When the oil tanker Sea Empress ran aground 30 years ago, some of south Wales' best-known beaches turned black.
Thousands of seabirds were killed off a globally significant stretch of coastline for wildlife in Pembrokeshire, while salvage crews fought for almost a week to lift the stricken tanker off the rocks and tow her to safety.
Described as "a wake up call" that led to changes in public attitude towards the environment, to this day there is anger and debate over how the disaster could have happened.
Experts warn climate change increases the risk of major pollution events in future on busier and more hazardous seas.
"It's all coming back to me 30 years later," said retired BBC reporter Hefin Wyn, looking out to sea at St Anne's Head, a remote spot at the entrance to Milford Haven waterway, one of the busiest ports in the UK.
