***Underwater sound maker***

[dannobee]

Problem with revving the engine is that there is so much boat traffic down here, you'd never know if it was your boat, or just one going by. And, I don't think the ladder banging would travel far enough. Sometimes we anchor or tie up at a mooring ball on the reef, and then could swim hundreds of yards away from the boat u/w.

I was diving in the Keys when a storm was approaching the boat while we were diving. We ALL heard the banging on the ladder with a big wrench. It was LOUD.

As for a "regular" noise maker, I sometimes carry an abalone iron and use it as a tank banger. It's quite effective, too.

 

[greengecko]

These work surprising well underwater.

Amazon.com: Storm Whistle Scuba Diving and Water Sport Safety Whistle World's Loudest Scuba Dive Diving Police Camping Boating Rafting: Sports & Outdoors

 

[joeSteve1006]

does anyone know if regular old Fox 40's work underwater?

 

[peterbj7]

I just use a stainless clip banged on the tank. For a boat recall signal we bang on a tank held under water, but to distinguish from other sounds we use a distinctive rhythm.

What's a "Fox 40"?

 

[joeSteve1006]

What's a "Fox 40"?

just a whistle, it uses no rattling ball for the sound, but uses airflow and is incredibly loud and used by referees. just seeing if anyone knew to avoid sticking my head in the bathtub and trying it out.

 

[joeSteve1006]

Fox40 | Home of the Famous Fox 40 Pealess Whistle
i tried it and the Fox 40 classic does work underwater. it starts bubbling for a sec then lets out an incredibly loud, well, whistle sound. they are cheaper than the "Storm Whistle" and certainly the loudest whistle i have ever heard.