I don't know if the details of precisely how the bubbles function have ever been released, but there's a fair few things that can be inferred from the reporting - there's been a few articles on bubble fatigue over the past couple of weeks:
Some Australian cricketers will spend six months in the quasi isolation of bio-secure hubs. It can't be healthy.
www.smh.com.au
With players already admitting that living in biosecure hubs takes it toll, a former Australian team psychologist has a suggestion for the year ahead.
www.smh.com.au
Australia's top cricketers remain hopeful a COVID-19 vaccine could ease restrictions or negate the need for bio-secure hubs this year.
www.smh.com.au
My understanding is that Australian players are under the same bubble restrictions as India, but obviously being a home series it's easier for them to leave and rejoin the bubble (e.g. the absences of Warner and Starc throughout). Sounds like it's also possible for them to get family into the bubble. From memory when the Adelaide restrictions came in mid-Test, Starc was saved on the basis of having to do a three-day at-home isolation before rejoining the bubble.
After paceman spent last week in Northern beaches
wwos.nine.com.au
The restrictions were described as being looser in Adelaide and Melbourne, and they sound similar to the BBL bubble rules (which came into focus with the Lawrence/Lynn breach in Canberra -
which was also indoor dining from memorywhich was selfie-related). Notably, Lynn and Lawrence played the match the following night but did have to isolate off-field and social distance on-field iirc (and were fined heavily).
Chris Lynn and Dan Lawrence being investigated for possible breach but will play in Monday's game…
www.cricket.com.au
Chris Lynn and Dan Lawrence escape suspensions but both players and club cop partially-suspended…
www.cricket.com.au