The story
- Proto-Indo-European*upó
- Proto-Italic*supo
- Latinsub
- Latinsub-
- Englishsub-
- Proto-Indo-European*mer-?
- Proto-Indo-European*móri
- Proto-Italic*mari
- Latinmare
- Latinmarīnus
- Old Frenchmarin
- Middle Frenchmarin
- Middle Englishmarin
- Englishmarine
- English todaysubmarine
Etymology from Wiktionary, CC BY-SA 4.0.