Hole in the wall

[ianr33]

We often get a white milky layer in our local lake once a strong thermocline has been established. I've always figured it's calcium sulphate. Calcium sulphate has the somewhat unusual property of being more soluble in cold water than it is in warm ,so will precipitate out when it meets warm water.

I also wonder if there is a bacterial element to this. Hydrogen sulfide formed from rotting vegetation in a low oxygen environment is acidic and will dissolve limestone to form calcium sulfide. When this calcium sulfide meets shallow,better oxygenated water the sulfide will be oxidized to sulfate. (possibly aided by bacteria?? )

Whatever the exact mechanism, it's pretty neat to see a thin white wisp right at the themocline.

[Dark Eternal]

I know what your talking about - but this milkiness is a lot more severe. Doesn't mean it couldn't be something like this, but it actually fills the entire tunnel and drops vis to a few feet normally.

[Captain Bil]

We dove Hole again last night. A slight variation, we went up the Century Tunnel a bit instead of EOL. The haze was right where it was last week, between 600 and 700. Temp was 68 at 81' deep. The haze appears striated and layered sort of when you shine a light through it. Kind of neat looking.

Conditions overall are fantastic. A bit hazy to the "layer", then clear beyond the layer. Century tunnel dropped to 65° in places, noticeably at 100'. Great dive.

Why is it called the Century Tunnel? Is it because it reaches 100' deep? Also, does anyone know why Alford's Room is so named?

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[Dark Eternal]

Century tunnel is indeed named for its depth. Not sure about Alfred's room, probably the original explorer?