Argus Bank (more properly known as Plantagenet Bank) is a submerged sea mountain that supports the man-made Argus Island (offshore platform, also called a Texas Tower). Argus Island is a SOSUS transmission line transfer point between the underwater sensors along Plantagenet Bank and the listening post located in Tudor Hill Laboratories (at the south edge of Bermuda island). Transportation of men and supplies was done between Tudor Hill Laboratories and Argus Island via R/V Erline.
Argus Bank had hosted the earlier Project Argus which employed a 1MW 400Hz SONAR. Aside from the active transmitter, much of that technology is similar.
The three seamounts are volcanic remnants from continental drift over a magmatic hot-spot.