I take people through lava tube swimthroughs all the time based on the NAUI guidance I posted earlier. I ALWAYS ask them if they're ok to proceed first and I don't take them through ones that are too narrow for us to go side by side.
Even though the NAUI guidance even allows entering a wreck (unless it has been modified for non-tech penetration), I wouldn't do that...it's too tempting for someone to take the next step and enter another area.
It's the same with many of the springs in Florida. You can enter "overhead" cave areas without "penetrating" since they have the caves blocked off.
I guess IMHO the cut-off between true "overhead" and "swimthrough" is the opportunity to get lost inside.
Even though the NAUI guidance even allows entering a wreck (unless it has been modified for non-tech penetration), I wouldn't do that...it's too tempting for someone to take the next step and enter another area.
It's the same with many of the springs in Florida. You can enter "overhead" cave areas without "penetrating" since they have the caves blocked off.
I guess IMHO the cut-off between true "overhead" and "swimthrough" is the opportunity to get lost inside.