Each group needs:

• shoebox with lid; in the lid make a grid formation (10 rows x 10 columns; see the Bathymetry Measurement Worksheet) of small holes that are the diameter of the sounding stick
• a "seafloor" to be fixed into the bottom of box; make this topographic relief from plastic, hardened clay, rocks, etc.
• sounding stick; use a thin rod that is longer than the box depth
• data collection sheets to create a bathymetry profile, ~10 per group
• scissors
• pencil
• ruler
• glue or tape