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On Twitter, customers said they were facing long delays, with many resorting to contacting the Acro Twitter account in the hope of securing their certificates.

The Acro Criminal Records Office provides records to police, exchanges them internationally and processes certificates for people wishing to work with children or gain emigration visas.

In the FPV world, this mode is called “Acro” and it really takes hundreds and thousands of hours to get comfortable with it.

Lead researcher Dr David Boilley, a nuclear physicist and chairman of Acro, told the Guardian: “The fact they want to build a dam and have boats going just by the bottom of the Chernobyl reactor – for me this is unbelievable. This is the most contaminated part of the exclusion zone.”

While it’s unclear what purpose the high-spine “sail” of the “Acro” may have served, some theories believe it may have been a defensive mechanism to appear larger or to regulate body temperature.