"One sailor was found around 1:25am. He was not breathing and did not have a pulse. He died soon after."
Huh. Yup. Sounds dead to me.
P.S. I had to look up "reefer ship." And, indeed, it is NOT a big old marijuana transportation device, but a refrigerated cargo ship. Ah.
Source: http://koreajoongangdaily.joins.com/news/article/article.aspx?aid=3046868 and http://english.yonhapnews.co.kr/news/2018/04/12/0200000000AEN20180412001251315.html