Buoyancy:

Buoyancy Force
http://www.explorescience.com/floatlog.htm

Physics of Diving
http://www.uwsports.ycg.com/reference_library/noaa/section_02/subsection_03.html

Animation:

Traditional and Computer Graphics Animation
http://www.geocities.com/Athens/Olympus/5297/index.html

Creating Dynamic Web Sites
http://webreference.com/content/dynamic/chap4.html

Let's Get Moving! The Animation Tutorial
http://www.geocities.com/Hollywood/Studio/9830/animating/animate.htm