Trying to remember this film

[Soubriquet]

It’s an oldie like 00’s I think.

There’s a group in a cave doing some form of research project. It becomes flooded and they have to swim for an alternate route out. In the end in the younger teen boy survives.

Sanctum?

Oh my that sounds like my worst nightmare something like that in a confined space.

Yes! Thank you.

All my Google searches were coming up with the Thailand boy cave rescue film