RE: They are head / in Marginal seal12 Jul 2021 17:47
Your probably right there...
But a really simple rough estimate....
1st show, 19th june--6:30pm local time on Saturday, depth of 70.5 metres SHOW
2nd show assuming July 6th (Mud video where bubbles were mentioned by posters)
Todays RNS Visual indication bubbles at ~560m
So 19th-6th ~490m/18days, or approx 27m/d