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Dealing with murky and very silty water...
- Thread starter TigerNed
- Start date
Angela (Australia)
New member
My hubby has dived for over 18 years, in all types of water. But at the beach, if the water is murky or cloudy, it can be very disconcerting when you can't see if you are approached by sharks, etc. He does carry a good dive knife with him, but he sometimes avoids going into the water if it's really bad. If you have a choice to hold off for better visability under water, it's probably safer. A lot of spear fishermen here carry a shark shield, if anything for peace of mind, particularly when diving alone. (www.sharkshield.com) Here is the website on it. As for rivers and lakes, we don't do a lot of that, but I guess in any situation, precaution is wise.
Cheers Angela
Cheers Angela
bunn leonard
New member
If your in an area that has Bull sharks you should be very worried they will swim in fresh water and is a very aggresive shark.
A
Anonymous
Guest
Shark experts believe that a Bull shark was responsible for the attacks in Matawan Creek in NJ back in 1916.
Also, I saw a different show that, if I remember right, stated that Bull sharks have their pups in fresh water, and the young sharks live in fresh water for a couple years until they're big enough to move into salt water.
HH from Allen in MI
Also, I saw a different show that, if I remember right, stated that Bull sharks have their pups in fresh water, and the young sharks live in fresh water for a couple years until they're big enough to move into salt water.
HH from Allen in MI
bunn leonard
New member
thats correct if im diving I research EVERYTHING! its not worth a leg arm or torso.
Angela (Australia)
New member
Yes, I've heard of Bull Shark attacks in fresh water, hence the account as mentioned by Allen in Matawan, in which the body of a 12 year old boy, Lester Stilwell, came to the surface three months after an attack on him. The creeks around here where I live are too shallow, and about three hours from the nearest entry point via the ocean. You wouldn't find sharks here. But in some of the channels leading into the ocean, where you're likely to find old bottles, I suppose there is always a risk of encountering a shark. In all the years my hubby dove, including diving for a living, he never once saw a shark. A diving buddy of his, did see a large shark circling him, but chose to say nothing, and coaxed Garry out of the water. Then told him. Garry never saw it. Other divers we know have seen them, and up close, usually the Bronzies, or Great Whites off shipwrecks. A friend of ours says the Great Whites were a little too curious. They love to taste things to see if its edible. Not trying to scare anyone here, but it does seem to be a quirk of these sharks.
Angela
Angela
SeattleALE
New member
I hunt one particular lake that has about 1 foot of slime even before you get to the mud, then that goes for another 2 feet before you hit the gravel. There is definitely the creepy factor going on, particularly when you look up a some fish is an inch from your mask looking for a free meal!!!
Then I'm retrieving a target and vis gets close to zero, I kinda go into this zen mode. I close my eyes to concentrate on my actions. I position my coil so that the target is just to the front and place the tip of my viboprobe just there. I move the coil to the side at arms length so that it doesn't interfere with the probe, and start making small circle with the probe, slowly going deeper and deeper. The target usually shows up pretty fast.
If I'm pretty sure the targets is relatively shallow, another way of doing it is to get the target just in front of the coil, keep it there, and with your free hand take scoops of mud front in front and drag them back over the coil. This works pretty well also.
In the interest of saving air time, I often don't bother trying to see what it was that I recovered. I just stick it in my bag and keep moving.
HH
SeattleALE
Then I'm retrieving a target and vis gets close to zero, I kinda go into this zen mode. I close my eyes to concentrate on my actions. I position my coil so that the target is just to the front and place the tip of my viboprobe just there. I move the coil to the side at arms length so that it doesn't interfere with the probe, and start making small circle with the probe, slowly going deeper and deeper. The target usually shows up pretty fast.
If I'm pretty sure the targets is relatively shallow, another way of doing it is to get the target just in front of the coil, keep it there, and with your free hand take scoops of mud front in front and drag them back over the coil. This works pretty well also.
In the interest of saving air time, I often don't bother trying to see what it was that I recovered. I just stick it in my bag and keep moving.
HH
SeattleALE
There is a bull shark in a water hazard at Cornubia golf course a little south of brisbane, (around 12 ft in length). It got in to the hazard during a flood. It has been seen on many occasions by local golfers. Personally I'd like to drop a grenade in beside it. There was another at a University campus in Brisbane with a large lake, A young man was fataly attacked, I don't know if it was destroyed or not. I have seen them at Lismore in NSW from a bridge there were 3 of them and they were around the 12 to 14ft mark. I used to swim at the place we saw them, not after that though. I am curious as to the shark shield, does it actually work? Will it stop a shark in full attack mode? Can it be used in conjunction with a metal detector in operation? I would also like a bangstick, (power head) however I am not allowed to own a firearm. Is it illegal to own a powerhead in Australia? Also looking for a buddy to keep lookout while I detect, I will share 50/50 all finds even share time on the Infinium LS. Thanks in advance, God bless Nugget.
I've been in touch with Paul Lynn from Shark Shield, It seems that the unit should have no effect on metal detectors, as it does'nt effect dive computers, digital camers, or any other electrical device. I am going to ask my local dive shop if I can trial one on my next dive. Will post the results ASAP afterwards, God bless, Nugget.
scotthowes
New member
SeattleALE said:
scotthowes
New member
I am a green bean to under water detecting i own a fisher 1280-x.primarily hunt a small lake in up state N.Y. that i live on.the lake is prehistoric there is at least a foot of silt on bottom with hard clay and gravel.Finding targets is the easy part getting them is another story.I am looking at a probe or wrist type.Scooping and fanning don't seem to work as well as my hand.the beach area has had sand put on it at least 75 years and2' deep with silt on top.It hard as a rock.Hunt from 2' to 15'.zero visibility mother lode is there just cant get it out i do this for fun but but I'm getting frustrated.any suggestions or advise would be appreciated.
I have done underwater search and recovery for more than 30 years. Most of it in zero visibility water with silt and or sand bottoms. This is how I do it.
First, I always dive alone, the buddy system does not work in zero vis water, but I have two other people on the surface. One is a backup diver who is suited up in case something goes wrong. The second is a tender, his job is to control the search and keep track of bottom time.
The tender holds a line that is attached via quick release to my harness. He feeds line out in intervals that match the width of the search pattern. For example, when looking for small items, he will feed out 3 to 4 feet of line at the end of each sweep. He holds the line in a fixed spot after feeding it out. He watches and signals me when it is time to turn and sweep in the other direction. My job is to keep the line tight and to search the area slowly.
If I find a target signal, I stop and plant my knees in a position to face the target. Then I scoop the bottom with a mesh scoop, let the silt or sand filter out and put whatever is in the scoop in a mesh bag. I rescan the area to see if I got the target and if not, I repeat the process until I have removed all targets.
Some times, the target is identifiable by feel so you know you have it. Other times, you keep going until you have retrieved all targets that give signals.
If the target is large or heavy, I attach the line to it and signal the tender that I have done so and am coming up.
If the search has to be stopped and will be restarted, the tender marks the line at the point he was holding and the next pass will start about 4 feet inside the mark to make sure nothing is missed.
A bigger problem than any marine life, is the trash that humans put in the water. Fishing line, cable, and trot lines are my main worries. I have been wrapped up in trot line and have had multiple hooks in my wet suit many times. Once, a trot line caught me and the far end of it snapped as I was trying to cut it. It had me so wrapped that they had to get the safety diver to swim to the other end and cut it then they had to pull me to the shore to get it off me. I could not move my arms or legs at all. That is why I always have a backup diver there.
The big thing is to always stay calm and think about doing a good job on the search. That keeps your mind off the other things in the water pretty well.
HH,
Rip
First, I always dive alone, the buddy system does not work in zero vis water, but I have two other people on the surface. One is a backup diver who is suited up in case something goes wrong. The second is a tender, his job is to control the search and keep track of bottom time.
The tender holds a line that is attached via quick release to my harness. He feeds line out in intervals that match the width of the search pattern. For example, when looking for small items, he will feed out 3 to 4 feet of line at the end of each sweep. He holds the line in a fixed spot after feeding it out. He watches and signals me when it is time to turn and sweep in the other direction. My job is to keep the line tight and to search the area slowly.
If I find a target signal, I stop and plant my knees in a position to face the target. Then I scoop the bottom with a mesh scoop, let the silt or sand filter out and put whatever is in the scoop in a mesh bag. I rescan the area to see if I got the target and if not, I repeat the process until I have removed all targets.
Some times, the target is identifiable by feel so you know you have it. Other times, you keep going until you have retrieved all targets that give signals.
If the target is large or heavy, I attach the line to it and signal the tender that I have done so and am coming up.
If the search has to be stopped and will be restarted, the tender marks the line at the point he was holding and the next pass will start about 4 feet inside the mark to make sure nothing is missed.
A bigger problem than any marine life, is the trash that humans put in the water. Fishing line, cable, and trot lines are my main worries. I have been wrapped up in trot line and have had multiple hooks in my wet suit many times. Once, a trot line caught me and the far end of it snapped as I was trying to cut it. It had me so wrapped that they had to get the safety diver to swim to the other end and cut it then they had to pull me to the shore to get it off me. I could not move my arms or legs at all. That is why I always have a backup diver there.
The big thing is to always stay calm and think about doing a good job on the search. That keeps your mind off the other things in the water pretty well.
HH,
Rip
dougmoore34
New member
n/t
I have some limited experience with limited/zero visibility under water metal detecting. It was limited because I didn't enjoy it and there were other areas with clear water to work. I worked in an area with heavy slit. Every move lifted the silt making it zero visibility. When you get a signal leave the coil on top of the signal and dig underneath it with the other hand. I might mention I was using a PI detector. Check for the signal in each hand full of dirt. Have an easy access bag that you can deposit your finds with dirt/sand included. It takes more practice to work under these conditions. I have to admit that diving alone was some thing I did a lot. A second diver in the water under these conditions is almost useless for the purposes of safety. A ready to go diver on the beach as was described above sounds like a useful relationship. Two working together will always be safer and more fun. Not to mention two are smarter than one and a partner can add to the equipment inventory. Interesting times to be you, I am not able to participate any more so I can only sit and read. Best to all, Mike.