Playing Indiana Jones and Emperor's Tomb and when swimming in first Level (a), none of the suggested controls (Spacebar, W, S, up arrow key) work in moving indie back up from the water in time to avoid drowning. He keeps "treading" and spinning and not moving forward or up. This is on PC, Windows 8, with keyboard and mouse.

Please help someone, it's the third time I've drowned here.

Just press and hold the spacebar to swim under water in the direction you're looking.