Top Underwater Signaling Devices to Keep You Safe While Diving
Whether it’s to point out a cool critter or to grab the attention of another diver in a time of need, tank bangers, rattlers and dive sticks can be vital pieces of gear.

Courtesy photoXS Scuba tank banger
How it works: Stretch out the plastic nob and let it smack against the side of the tank. It fits 6.9- to 8-inch-diameter cylinders.
xsscuba.com; from $5.95

Courtesy photoXIT 404 dive stick
How it works: Great for muck divers, the dive stick aids in pointing out interesting marine life.
xit404.com; from $15

Courtesy photoScuba Sonics Aqua Maraca
How it works: A simple shake of this maraca can be heard from over 30 feet.
scubasonics.com; from $29.95

Courtesy photoAquatec Sub Alert
How it works: Compact in size, this underwater horn attaches to the inflator hose and delivers noise over a half mile.
scuba-aquatec.com; from $46.99