At the sealed chamber midway between Pacifidlog and Slateport (accessible only from Pacifidlog) use Dive to enter a tunnel that leads to a slab with braille. Surface there and enter the sealed chamber.
The next step is to go to the back of that room and use Dig on the space where you see braille in the back of the room to open up the next area.
Go to the rear part of the second room and read the inscriptions. It says you must have a Relicanth in the lead slot and a Wailord in the last slot (of your Pokemon line-up). You will then open up the entrances to each lair.
Open The Regirock/Registeel/Regice Lairs
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