Submersible device with selectable buoyancy

An apparatus, comprising:

• a container configured to be variably buoyant in a liquid, the container defining a first partitioned section and a second partitioned section, the first partitioned section being substantially liquid resistant, the second partitioned section defining a hole in communication with an exterior of the container;
• an actuator configured to receive an input from a user and configured to modify an interior volume of the second partitioned section based on the input;
• an audio system disposed within the first partitioned section, the audio system including a speaker in audio communication with the exterior of the container, the audio system configured to produce an audible output for a user-selected time period and with a volume that increases as the user-selected time period nears expiration;
• a timer disposed within the first partitioned section and coupled to the audio system;
• wherein the second partitioned section defines a reservoir in communication with the hole;
• a sensor disposed within the reservoir, the sensor configured to determine an amount of liquid received within the reservoir;
• and
• a pump, the sensor being coupled to the pump and being disposed within the second partitioned section, the pump configured to expel or intake liquid based on a signal from the sensor.