I loved my LC-A+ Krab a lot this summer. One thing I couldn't get used to, was the inability to reach my MX switch. I'm a nut for double exposures. So I decided to use it for a layer roll and re-use it out of the aqua.
So it isn’t hard to do. Make sure you know what sprocket holes you were on when you loaded your film, that way you can match it up for the next round. Thinking back, I should have set the iso 1-stop down from what the film was rated so it didn’t blow out the second shot later. Set the focus to depth of the pool floor and stick it under the water. I swirled my arms around to get the light ripples going in the surface. You can also have a friend splash the surface to get different effects. I pointed the camera down at the pool floor and shot away. Once I was done, I rewound the film almost all the way and re-inserted it into the Lomo LC-A+. After that, I had a roll to shoot, on dry land, with some strange effects. So now you don’t have to retire your LC-A + Krab just because the weather is cold. Submerge and have fun, folks!