How long does it take for a dead body to float to the surface after drowning ?

The time it takes for a dead body to float to the surface after drowning is influenced by several factors, including water temperature, body composition, and the presence of gases produced during decomposition.

Here are some key points to consider:

Initial Sinking

After drowning, the body typically sinks to the bottom of the body of water because the lungs fill with water, increasing the body's density345.

Decomposition and Gas Buildup

As the body decomposes, bacteria and other microorganisms produce gases such as carbon dioxide, methane, and hydrogen sulfide. These gases accumulate within the body, causing it to bloat and become more buoyant45.

Time to Surface

The time it takes for the body to float to the surface due to this gas buildup varies significantly:

• In warmer waters, this process can occur relatively quickly. For example, at water temperatures of:
  • 40°F (4°C), it may take 14-20 days for the body to surface.
  • 50°F (10°C), it may take 10-14 days.
  • 60°F (15°C), it may take 7-10 days.
  • 70°F (21°C), it may take 3-7 days.
  • 80°F (27°C), it may take 1-2 days1.
• In general, the warmer the water, the faster the decomposition process and the sooner the body will float to the surface345.

Other Factors

Other factors such as body composition, the type of water (freshwater vs. saltwater), and the presence of currents or debris can also influence the time it takes for the body to surface135.

In summary, the time for a dead body to float to the surface after drowning can range from a few days in warm water to several weeks in colder water, depending on various environmental and physical factors.