He squeezed into/through the 'hatch' and crawled below deck.
They 'hatched' a plot to overthrow the government.
a whiskey that goes 'down the hatch' smoothly
(..) The males are still carrying the precious eggs that they've cherished throughout the Antarctic winter. With the returning sun the eggs hatch. Other birds have not even arrived. but the Emperors by enduring the long black winter have given their chicks (..)2006 TvShow: Planet Earth Title: From Pole to Pole Season: 1 Episode 1