Ann: Weekly Operational Report , page-3

You only pay interest on the drawdown amount.
For example you may have 200 million available
but have only used 50 million. Therefore interest on 50 million only.

At 5% is around 2.5 mill a year interest.

2000 barrells a day at say 60$ a barrel = $120,000 a day
$120,000 x 365 = About 48 million a year

You have to spend money to make money and AZZ are doing it well.