  The cross section of the reaction $pp \to pp \gamma \gamma$ is estimated and
the exploration possibilities of this reaction to probe for a possible
excitation of subnuclear degrees of freedom in two-nucleon systems, in
particular, the production and decay of the NN-decoupled dibaryon resonances,
are briefly discussed.Some arguments for and implications of the intermediate
dibaryon resonance excitation are inferred from preliminary data on the
two-photon yield and energy distribution observed by the DIBAR2$\gamma$ -
Collaboration at the kinetic energy of the initial proton $T_{lab} \simeq 200
MeV$.
