訓 もぐ(る),ひそ(む) ・ 音 セン
Sino-Vietnamese: tiềm
Water 氵 for meaning: sinking beneath the surface. Out of sight underwater also means lurking and latent. See sensuikan, a submarine, and senzai, latent.
Stroke data: KanjiVG (CC BY-SA 3.0) — kanjivg.tagaini.net
海に潜って魚を見ました。 (うみにもぐってさかなをみました)
I dived into the sea and saw fish.