How should puncture leaks in the lower tubes of an inflatable liferaft be first addressed?

When addressing puncture leaks in the lower tubes of an inflatable liferaft, using sealing clamps is the most effective first response. Sealing clamps are specifically designed to create a tight seal around punctures, which helps to prevent the inflation from escaping. This method provides a secure and reliable fix to maintain the integrity and buoyancy of the liferaft until a more permanent repair can be made.

Sealing clamps can easily be placed over the damaged area, compressing the material to seal the leak effectively. This method ensures that the liferaft remains functional and can provide safety to individuals until further assistance is available.

Other methods like tying knots, applying duct tape, or placing heavy objects are less effective in creating a proper seal and may not withstand the pressure and movement that a liferaft experiences during use. These alternatives may lead to the leak re-opening, thus compromising the liferaft's ability to float and provide safety.