  Since the initial detection of Gravitational Waves in 2015, 50 candidate
events have been reported by the LIGO-Virgo-KAGRA collaboration. As the current
generation of detectors move towards their design sensitivity the rate of these
detections will increase. The next generation of detectors are likely to have
high enough sensitivities that multiple merging binaries will be visible at the
same time. In this paper we show that this is likely to happen before the end
of the decade, with the move to the LIGO-Voyager detector. We investigate the
situation of overlapping Binary-Black-Hole mergers in these detectors. We find
that current parameter estimation techniques are capable of distinguishing the
louder of two merging BBH events, without significant bias, when their merger
times are not less than $\sim0.1$ seconds apart and when the ratio of the
signal-to-noise ratios of the systems is uneven. This region of overlapping
parameter space is dependent upon the sky locations of the signals and the
relation of those locations to the light travel time between detectors. We also
find that, if two signals are highly overlapping, then the recovered set of
parameters often show strong evidence of precession. Finally we show that bias
can occur even when the signal causing the bias is below the detection
threshold.
