Verbseoul.
하다 verb
잠수하다jamsuhadato submerge, to go underwater

To say to submerge, to go underwater politely in the present tense, use 잠수해요 (chahm-soo-hae-yoh). Below is the full conjugation of 잠수하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
잠수해
chahm-soo-hae
잠수해요
chahm-soo-hae-yoh
잠수합니다
chahm-soo-hahm-nee-dah
Past
잠수했어
chahm-soo-hae-ssuh
잠수했어요
chahm-soo-hae-ssuh-yoh
잠수했습니다
chahm-soo-hae-sseum-nee-dah
Future
잠수할 거야
chahm-soo-hahl- -guh-yah
잠수할 거예요
chahm-soo-hahl- -guh-yae-yoh
잠수할 겁니다
chahm-soo-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
잠수하세요
chahm-soo-hah-sae-yoh
Suggestion / Let's Polite (요)
잠수해요
chahm-soo-hae-yoh
Question Polite (요)
잠수해요?
chahm-soo-hae-yoh-?
Connective “and” — (고)
잠수하고
chahm-soo-hah-goh
Conditional “if” — (면)
잠수하면
chahm-soo-hah-myuhn
Noun form — (기)
잠수함
chahm-soo-hahm