Umm Haram reported the Prophet ﷺ as saying “He who becomes sick on a stormy sea and vomits will have the reward of a martyr. And he who is drowned will have a reward of two martyrs.
Hadith Referenceسنن ابي داود / كتاب الجهاد / 2493
Hadith Gradingالألبانی:حسن | زبیر علی زئی:إسناده حسن, مشكوة المصابيح (3839)