GUT that is representative of a class of grand unified theories that have just a single mass scale, $\tilde{m}$. We study the spectrum, dark matter, gauge coupling unification and proton decay in this model. In Section \[sec:scales\] we argue that in ISS other fundamental physics may be linked to the scale $\tilde{m}$, in particular, neutrino masses, axions, and inflation. Finally we summarize in Section \[sec:summary\].

Higgs Quartic Coupling and ISS {#sec:ISS}
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Before entering into the main part of the paper, in this section we discuss the scale of supersymmetry breaking suggested by the current experimental data within the ISS framework. In Fig. \[fig:scale\_lambda\], we show the running of the $\overline{\rm MS}$ Higgs quartic coupling $\lambda$ in the SM as a function of the renormalization scale $Q$ (solid, black line). Here, the dark and light shaded regions correspond to the 1-$\sigma$ and 2-$\sigma$ ranges for the experimental input parameters, respectively, for which we have used $m_t = 173.34(76)~{\rm GeV}$ [@ATLAS:2014wva], $m_{h^0} = 125.40(45)~{\rm GeV}$ [@ATLAS:2013mma; @Chatrchyan:2013lba], $m_W = 80.367(7)~{\rm GeV}$, $m_Z = 91.1875(21)~{\rm GeV}$ [@Baak:2013ppa], and $\alpha_3(m_Z) = 0.1184(7)$ [@Bethke:2012jm]. The figure also shows the running of $\lambda$ in the cases that the wino and gluino exist at $1~{\rm TeV}$ 