Years ago in returning to the UK after my father’s posting to the Far East we travelled on a 10,000 ton P & O vessel voyaging around the Cape because the Suez canal was still blocked from the Arab-Israeli war. By the time we hit the Roaring Forties we had all gained our sea legs which was just as well given the mountainous seas that we ploughed through. We were all confined to lounges and decks aft of the forecastle as the Indian Ocean sprayed over the bows in 30 foot waves. It was an exciting ( terrifying ) rollercoaster of a day as we pitched high through one gigantic wall of water before falling, weightless like, into the next trough that we hit with a grinding, creaking crash that shook every deck. Meal service had been suspended for the day and in traversing below decks to our cabins we were stumbling as much along the foot of the passageway walls as their floor.
I have never experienced anything like it since. The sheer power and turbulence of those seas was truly awesome.
How yachtsmen do it is beyond any understanding - they must be on amphetamines.
I think the Thai ship mustn’t have battened down those hatches.