News: SEA Sundance Energy Australia Ltd Q2 Net Sales Volumes Up 79%, page-12

Can't say I agree with you that debt is not an issue in a low to zero interest market.
There are many types of debt both secured and unsecured and they attract a wide spread of interest rates even in a low interest rate environment as it depends on how risky the company is.

There is no way SEA will be able refinance the existing debt at say below 3%.
It will more likely be refinanced nearer 10% and will most likely be secured debt which means the lender has first rights on the asset sales if the company goes under.

The main two things holding the share price back is the outstanding debt and of course the low oil price.
The market needs to see that SEA will eventually be able to repay the debt and when they do the share price will react accordingly.

I think anyone who just ignores the debt in this company is not reviewing the company correctly.