Bio-secure-bubble is to create an environment or situation where people's external connection is completely broken. There everything happens under the rules of standard operating protocol. In this, players have to follow the rules strictly. They are physically cut off from the outside world by the time of the tournament. They are not allowed outside that biological safe environment. It is like a fictional bubble in which players have to be very restrained till the end of the tournament, hence it is called bio bubble. Bio bubbles can be made in any part of the place. A place is chosen where there is no easy contact with anyone outside the bubble. The players staying in it are allowed to go to the outer fixed place. Separate bio-safe zones are created for players, staff, and medical personnel, and all have to remain within their designated areas.
Although its rules are very strict, the way the general public violates the rules many times, the same can happen in the case of bio bubble. Therefore, nothing can be said with certainty about its effectiveness. If someone wants to go out under special circumstances, then he is allowed to go on the basis of some rules. But it is very difficult to return to the bubble again. If the settlement is allowed, then quarantine can be returned to the bubble.
Taiwan's basketball match can be considered as the first instance of the bio bubble which was completed in 2019 and followed the rules very strictly. In 2020 too many sports such as hockey, cricket, football, etc. were organized by different countries keeping in mind the bio bubble.
There was an attempt to stay in the bio-bubble of IPL 2021 but the league could not protect itself from the virus and after several positive cases surfaced, the BCCI decided to postpone the IPL indefinitely. This time, one of the reasons for the bio bubble's failure is the dangerous form of Corona's 2nd, which probably has the ability to cross the Bio Bubble as well.