Cluster ballooning is an uncommon form of ballooning in which a single balloonist is attached by a harness to a cluster of relatively small helium-inflated rubber balloons. Unlike traditional hot-air balloons, which possess vents for easy altitude control, cluster balloons rise uncontrollably, expanding as they go.
Cluster balloonists must periodically cut balloons loose to maintain altitude and descend. Bottled water is a common ballast, and can be partially emptied to slow descent.
(via UniqueDaily)
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