Bio-secure bubble
hosting of sporting events in a single, protected environment

A bio-secure bubble, also known as a bubble, or hub city, is a hosting arrangement for sporting events, under which events were held at a centralized site, often behind closed doors, with strict quarantine and safety protocols in order to prevent the spread of illness. A bubble was established for a single sports season, tournament, or for an ongoing series of events, allowing them to still be held and made available to broadcast audiences.
Aspects
A bio-secure bubble typically consisted of multiple sites comprising a secure perimeter (often near each other), including player residences (such as hotels), training facilities, and the venue proper. All participants, including players, team staff, and other staff (such as broadcasting staff present on-site) were screened and tested for COVID-19 before entering the bubble, live within its confines for the duration of the event, and were prohibited from leaving the perimeter until they had completed play. The participants were screened and tested regularly for COVID-19, and restricted from access to and by the general public. Participants were reprimanded and penalized if they breached biosecurity protocols while within the bubble.
As they were usually held without public spectators, events within a bubble were typically produced with television audiences in mind, and broadcasters were able to employ production techniques not possible in a typical venue with fans, such as different camera angles (including drone cameras) and enhanced microphone configurations. The venue was customized with video boards and artificial crowd noise to simulate the experience of the designated home team's venue, and display mosaics of "virtual" fans via videoconferencing.
Usage
Basketball
Taiwan's Super Basketball League was the first basketball league in the world to move competition into a bubble setting in order to complete the season.
The National Basketball Association was among the first major American sports leagues to suspend play due to the COVID-19 pandemic.
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