  The Nijmegen OBE potential D is SU(3) rotated to model the strangeness -2
sector of the baryon-baryon force. Soft core repulsion is introduced to
regularize the singular nature of the OBE functions. The strength of the
$^1$S$_0$ $t=0$ interaction is adjusted to model three scenarios: (1) a bound
state, (2) a narrow virtual, or antibound, state, and (3) an unbound state in
which the force is weakly attractive. Using a separable approximation to these
potentials, the binding energy of $^{6}_{\Lambda\Lambda}$He is calculated in an
$\Lambda\Lambda\alpha$ model. The resultant binding energies suggest that the
strength of the $^1$S$_0$ $t=0$ $\Lambda\Lambda$ and the $nn$ interactions
should be similar, if the coupling between the $\Lambda\Lambda$ and $\Xi N$
channels is taken into consideration.
