  We consider the problem of minimal volume vector fields on a given Riemann
surface, specialising on the case of $M^\star$, that is, the arbitrary radius
2-sphere with two antipodal points removed. We discuss the homology theory of
the unit tangent bundle $(T^1M^\star,\partial T^1M^\star)$ in relation with
calibrations and a certain minimal volume equation. A particular family
$X_{\mathrm{m},k},\:k\in\mathbb{N}$, of minimal vector fields on $M^\star$ is
found in an original fashion. The family has unbounded volume,
$\lim_k\mathrm{vol}({X_{\mathrm{m},k}}_{|\Omega})=+\infty$, on any given open
subset $\Omega$ of $M^\star$ and indeed satisfies the necessary differential
equation for minimality. Another vector field $X_\ell$ is discovered on a
region $\Omega_1\subset\mathbb{S}^2$, with volume smaller than any other known
\textit{optimal} vector field restricted to $\Omega_1$.
