Again he's skeptical, but he's not going to force her.

"Let's go."

He still wishes he had something to help cover her nose, but...again, would it really do anything? Ugh, how do things work underwater... In any case, he'll swim alongside her, staying only a little ahead so that if anything does appear, he can try and get to it first. One might think it even more dangerous that he has no weapon on hand, but he was used to just dealing things with his fists. How that will translate underwater—hopefully they never have to find out.

After swimming for a little bit, he'll glance down at her.

"Doing okay?"