Landsat TM3 can be used to generate sea-bed images

In these examples from the west coast of Western Australia, the imagery is accentuated to show features in water up to 15 metres deep, as well as detailed shallow water morphology.

Shark Bay deep water, Western Australia: Landsat TM3 1998-2005 RGB 321 (natural colour)

Offshore deep

Shark Bay coast, Western Australia: Landsat TM3 1998-2005 Gozzard Ratios (left) and RGB 321 (natural colour; right)

Shark Bay ratios Shark Bay natural