Speleology is carried out by intersted amateur scientists, cause it's no independent branch of science.

From left to right:

On the left pcture one can see, that a speleologist should be kind of athletic, if it is e. g. up to getting through narrow holes like this here. The picture in the middle shows the devlopment of a doline (that's a funnel-shaped crater in the karst rocks). The left image shows us the development of stalactites (ceiling "dripping stones") and stalagmites (ground "dripping stones"), and their fusion to a column.

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From left to right:

On the left we see the inner part of the "Mordloch" (= murder hole) near Geislingen/Wuerttemberg, a cave with water streams inside; in the middle and right we see beautiful examples for the stalactite scape in caves.

More about the Mordloch you can find under allmendinger.de and the general cave page.

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Here one can see by means of the people in this american cave the dimensions of some halls.

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On the left an impression from the Hermannshöhle in Rübeland in Harz mountain. On the right we see the sinter basin in Pamukkale/Turkey, an overground karst phenomenon.

More about the topic speleology (cave research) you can find under karst.net, the page of a friend.