Noted @Bob, but wow, almost on the waterline...

Tankers generally have less freeboard than dry cargo ships of comparable length and are considered to be safe because they have much smaller deck openings than the hatches on a dry cargo vessel and also they have greater sub-division by the additional longitudinal and transverse bulkheads.
In addition, cargo oil has greater buoyancy than, say, a grain cargo.
Actuall , on THUNTANK 12 the “deck” that is down on the waterline is in effect just a walkway between the after deck and the forecastle. Just inboard, the sides of the cargo tanks rise up to the height of the forecastle. That's more feeboard

Not enough to paint the Plimsoll line on!
Holedriller

Hardly any freeboard.....