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The propagation speed of pressure head waves in wave groups is reduced to a half at the base and columns of a gravity offshore platform. The same phenomenon is noticed also at submerged tunnels. This explains why the horizontal wave force on large isolated bodies is greater than the Froude–Krylov force. This is the kernel of the chapter, which is based on small-scale field experiments, and exploits the powerful synthesis made possible by the QD theory when applied for analysis-of-time-series data (the chapter shows a pair of figures most evident of this capability to do synthesis). As a consequence, the chapter suggests a general method to calculate the largest wave forces on large isolated bodies, and supplies a FORTRAN program useful for this scope, which will be applied in Chapter 13.