Hadith #2493 (Sunan Abi Dawud)
Book: Jihad (Kitab Al-Jihad)
Narrator(s): Abd al-Salam bin Atyq عبد السلام بن عتيق, Abdul A'ala bin Mushir al-Ghasani عبد الأعلى بن مسهر أبو مسهر الغساني, Abdur Rahman bin 'Amr al-Awza'i عبد الرحمن بن عمرو أبو عمرو الأوزاعي, Abu Umama al-Bahili, Sulaiman bin Habib al-Maharbi سليمان بن حبيب المحاربي
Grade: Hasan

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.

Source: https://parallelquran.com/hadith/sunan-abi-dawud-2493/