Sentence:  In Gdynia 90 per cent of the <WSD>waterbreaks</WSD>, 45 per cent of the quays and nearly all the warehouses were destroyed; in Gdansk the corresponding figure for <WSD>waterbreaks</WSD> and quays was 20 per cent and the warehouses and virtually all the handling equipment ceased to exist. 
Meaning of the word marked with <WSD> tags:  A breakwater.