Coral reef chasm frames underwater photographer.

Diver with scooter confronts a goosefish.

Perry wet sub and mobile habitat (MOHAB) off Lee Stocking Island.

French angelfish looks larger than observing diver.

Diver deploys respiration bubbles over coral heads.

Diver with rebreather and heated dry suit prepares to descend into the ice.

Divers are able to collect rock cores from vertical walls on a coral reef.

Divers test rebreathers which are useful for extending bottom time.

Diver with a full face mask and underwater radio observes large vase sponge.

Ending the dive-- ascending to the sunlight.

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Surface supply delivers unlimited air to the divers, but keeps them on a leash.

Diving bell serves as a transport and refuge for divers.

Dive bell equipped with compressed air allows divers to decompress underwater.

Dive bells provide a stable mid-water station for air,and communications.

Clear dome in this bell allows scientists to record observations in midwater.

In the air-filled bell dome, divers can talk to each other and the surface.

Stable on the pool bottom, a bell bobs when hanging from a pitching ship.

NURC at UNCW's dive bell deployed from the R/V Seahawk.

A dive bell support ship must be in a multi-point mooring to avoid dragging.

Surface supplied air is used in polluted water to avoid contact or ingest.

Compared to old hard hat diver, Exo mask diver doesn't need lead boots.

A dome for talking to the surface and other divers. It is called a personal talk station or PTS.

Early hard hats were heavy in air, but buoyant underwater.

Surface-supply and dive bells greatly extend the time divers could stay down.

NURP dive bell used in the 1980s-- scientists prefer the freedom.of scuba.

Umbilical diving through the ice provides a safety line back to the hole.

J. Peress' 1-atm dive suit, Tritonia, explored the Lusitania wreck in 1935. Jim Jarrett was Peress's chief diver and made this dive to 312 feet. This suit was a precursor to the "Jim" suit, named for Jim Jarrett.

New bubble helmets popular for TV-- speech is clear and face is visible.

Pre-dive check list ensures safety of bell dive operations.

Perry ROV uses a "garage" to hold its umbilical.

Harbor Branch Oceanographic's SCOOP is used as a safety backup for subs.

Some manipulator arms have tactile feedback and can handle delicate items.

NURP's Hawaii center operates an RCV-150 as a safety system for its sub.

Manipulator arms with tactile feedback are especially useful for science.

NURP1 MiniROVer's fresnel lens used for counting particles and plankton.

Deploying the PHANTOM S2 through ice in Antarctica.

PHANTOM 300 guided by diver records a stalagmite in a cave in the Bahamas.

PHANTOM S2 working hard bottom reef in the Gulf of Farallons Sanctuary.

VENTANA operated by the Monterey Bay Research Institute.