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Hi, Tony. Welcome to the underwater research lab.

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Please, Dr. D. Thanks for inviting me.

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I understand that you have some exploration in mind.

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I certainly do.

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I was amazed to find out how much scuba divers can accomplish

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when they stay in an underwater habitat like the Aquarius.

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Scuba divers generally have a maximum depth of 40 meters

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and with special equipment maybe up to 600 meters.

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Why can't they go deeper?

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Well, the real problem is pressure.

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The deeper you go in the ocean, the greater the pressure.

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Why is pressure a problem?

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Well, look at this bottle.

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How did you crush the bottle, Dr. D.?

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I didn't. The pressure crushed the bottle as I brought it down to the lab from the surface.

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Every 10 meters out in the ocean, the pressure increases by one atmosphere.

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So, what if my treasure is, say, theoretically deeper than 600 meters?

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You can use a submersible or mini-submarine.

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They have thick reinforced walls instead of increased air pressure.

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It can go as deep as 6,500 meters.

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So, you're saying if I brought a glass bottle down to the Aquarius,

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it wouldn't collapse because it's stronger than the plastic bottle?

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Very good. Another type of submersible is an ROV, or remotely operated vehicle.

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In fact, I have one right here.

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You're kidding.

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Well, mine is a lot smaller than a research vessel and it uses radio control instead of a cable.

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Maybe I could use an ROV to help with my treasure hunt.

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Good idea. Besides locating large treasure ships,

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we can also use these vehicles to inspect oil rigs and pipelines

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and to investigate ocean ridges and geothermal vents.

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What are these?

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These are my two other submersibles called RBUVs.

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Let me guess. Rubber band underwater vehicles.

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You're really on the ball. Let's go outside and have an RBUV race.