"a sickening sensation"

Here's Shackleton's version in South...

"The attack of the ice reached its climax at 4 p.m. ... The decks were breaking upwards and the water was pouring in below. Again the pressure began, and at 5 p.m. I ordered all hands on to the ice. The twisting, grinding floes were working their will at last on the ship. It was a sickening sensation to feel the decks breaking up under one's feet, the great beams bending and then snapping with a noie like heavy gun-fire. ... The plans for abandoning the ship in case of emergency had been made well in advance, and men and dogs descended to the floe and made their way to the comparative safety of an unbroken portion of the floe without a hitch. ... I cannot describe the impression of relentless destruckion that was forced upon me as I looked down and around. The floes, with the force of millions of tons of moving ice behind them, were simply annihilating the ship."