Scooter, because your pool is not a sealed enclosure, the water leaving does not need to be replaced by anything, thus no bubbles (it's not like turning an open water bottle upside down).
If you want to save yourself from diving and looking all over the pool for a hole you may or may not see (needle in a haystack), try what I suggested - fgeel around for a soft/spongy spot under the liner, if it's near the edge, it can be on the wall or cove, if it's further in from the edge, it's likely on the floor.
Steps and stairs are always your first suspect locations since they beat up on the liner. Also look for pebbles that may have pushed up and are causing hard but pointy bumps on the floor, sometimes vacuums will wear the tips down causing a hole.
For the amount of water you are losing, the hole size can be as small as a 1/4" split in the liner.