TECHNOLOGY FOCUS - BIOLOGY - Preferred Components: The microorganism is a fermentative gas-producing microorganism, or hydrogen, methane or carbon dioxide producing microorganism. The microorganism is Clostridium sp. or Clostridium acetobutylicum.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Method: In the method, the pressure chamber is capable of maintaining a gas pressure of at least 10 psi above atmospheric pressure, and the gas pressure in the pressure chamber is allowed to increase to 10 psi above atmospheric pressure. The method (I) further comprises: venting a portion of the gas through the vent; and repeating allowing the gas pressure to increase and venting a portion of the at least one time. The method (II) further comprises moving the liquid from the exterior of the container into the ballast chamber so that the container sinks. The method (IV) further comprises venting gas from the bladder to the exterior of the container and the bladder.    TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Composition: The apparatus further comprises: a vent coupled to the pressure chamber configured to release gas produced by the microorganism; a container enclosing the pressure chamber; a divider within the container dividing the container into a ballast chamber and a dry chamber, where the vent is configured to move gas from the pressure chamber to the dry chamber; a gas valve configured to move gas from the dry chamber to the ballast chamber; a ballast valve configured to move liquid between ballast chamber and the exterior of the container; a floater chamber having a gas inlet coupled to the vent, a second gas vent, and a liquid vent; a float and a weight coupled to the floater chamber, where the float has a lower density than the floater chamber, the weight has a higher density than the floater chamber, the aggregate density of the floater chamber, the float and the weight is greater than the density of the floater chamber, and the gas inlet, the second gas vent, the liquid vent, the float and the weight are positioned on the floater chamber so that: when the floater chamber is filled with and submerged in a liquid in which the floater chamber is neutrally buoyant, the floater chamber is oriented to place the second gas vent below the gas inlet; and when a gas is introduced through the gas inlet into the floater chamber that is filled with the liquid, the floater chamber pivots to raise the second gas vent until a portion of the gas escapes from the floater chamber through only the second gas vent; and an inflatable bladder having a release vent coupled to the vent.