View Full Version : tied in a knot
not your every day diving diving problem but it shows you how the simplest problems can be difficult to resolve underwater.
the diver in question was at 45 feet depth in crystal clear water at the time.:rolleyes:
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dive granny
13-04-08, 21:15
:eek::eek::eek:
Holy crap, he wanted to cut his umbilical first ???
dive granny
13-04-08, 22:30
I know a baby's umbilical is vital to life, so assuming by the name, so is the divers what is he attached to? Clearly not a good idea to cut it.
Holy crap, he wanted to cut his umbilical first ???
he did appear a little confused eh?.:rolleyes:
for info, the bailout cylinder feeds the hat even if the umbilical is cut. (as proved in the video).
the hat is fitted with non return valves so it wont flood.
what is more alarming is the super asked him to stick the numo inside his neck dam which would have flooded his helmet if he cut the umbilical.:eek:
what he intended to say was for the standby diver to stick his numo in to the trapped divers hat. :o
did you notice at the end how difficult the knot looked to untie? :rolleyes:
imagine doing that in scotland out in the fourth in 200mm viz!
I know a baby's umbilical is vital to life, so assuming by the name, so is the divers what is he attached to? Clearly not a good idea to cut it.
the umbilical has a breathing air line as its surface supplied, communication cable, video cable, power for lights & a pneumofathometer (depth gauge).
cutting it isnt really something you would aspire to do.
It looked well knotted, how the heck did it get so bad, espcecially through a small loop. Was it set up as a training excercise or was that real?? The guy was pretty calm throughout. Loved the blade on the wrong way too, thats why I thought training excercise!
Looks like he'd been scampering up and down the blocks and managed to drop himself through a loop that had passed through the lifting eye.
Once the bell took up the slack it pulled the knot shut with no apparent way of undoing it. I reckon he needed more slack from the bell to make the loop big enough for him to go back through the way he came.
Certainly not something for low-viz and cold water.
Couldn't the standby, once the diver was on bail-out, disconnect the umbilical from the hat, unfankle it and reconnect it?
It looked well knotted, how the heck did it get so bad, espcecially through a small loop. Was it set up as a training excercise or was that real?? The guy was pretty calm throughout. Loved the blade on the wrong way too, thats why I thought training excercise!
it was for real, this isnt something you would be trained to do.
Looks like he'd been scampering up and down the blocks and managed to drop himself through a loop that had passed through the lifting eye.
Once the bell took up the slack it pulled the knot shut with no apparent way of undoing it. I reckon he needed more slack from the bell to make the loop big enough for him to go back through the way he came.
Certainly not something for low-viz and cold water.
from what i have read on another forum, the diver looped the umbilical through the lifting eye, then swam through to hold himself on the job. (not smart)
on the return, he stepped through it the wrong way, hence the knot was created.
there was loads of slack for him to sort it out (view vid around 4 minutes+), the knot was only tightened at the end to cut the umbilical closer to the hat.
Couldn't the standby, once the diver was on bail-out, disconnect the umbilical from the hat, unfankle it and reconnect it?
in theory, yes, but he would have to remove the lights and video camera from the hat also (easy job, 2 x machine thread screws (screwdriver) or might be quick release (thumb))
if he disconected the umbilical from the hat and the diver was on bailout he would be more at risk 'hanging about' waiting for the untangle & a reconnection that might fail.
changing an umbilical is a practiced bell training excercise, but an alternate umbilical is used.